diff --git a/ispc3-ai.sh b/ispc3-ai.sh
index 01222274ba267366f558c0cb00775b6a238235f8..0164f4486ab7064c773f4013a96a5289dd5425ad 100755
--- a/ispc3-ai.sh
+++ b/ispc3-ai.sh
@@ -10,6 +10,11 @@ WGET=$(which wget) ;
 PHP=$(which php) ;
 APT=$(which apt-get) ;
 
+use_git=false;
+if [ -d .git ]; then
+  use_git=true;
+fi
+
 if [ "$APT" = "" ] ; then
 	echo "It seems you are using a distribution that has no apt-get available. This is not supported.";
 	exit 1 ;
@@ -37,29 +42,34 @@ if [ "$PHP" = "" ] ; then
 	exit 1;
 fi
 
-if [ "$CURL" != "" ] ; then
-	$CURL -s -o /tmp/ispconfig-ai.tar.gz "https://www.ispconfig.org/downloads/ispconfig-ai.tar.gz" >/dev/null 2>&1
-else
-	$WGET -q -O /tmp/ispconfig-ai.tar.gz "https://www.ispconfig.org/downloads/ispconfig-ai.tar.gz" >/dev/null 2>&1
-fi
+INSTALL_DIR=".";
+if [ "$use_git" = false ] ; then
 
-if [ ! -f "/tmp/ispconfig-ai.tar.gz" ] ; then
-	echo "Failed downloading Autoinstaller" ;
-	exit 1;
-fi
+	if [ "$CURL" != "" ] ; then
+		$CURL -s -o /tmp/ispconfig-ai.tar.gz "https://www.ispconfig.org/downloads/ispconfig-ai.tar.gz" >/dev/null 2>&1
+	else
+		$WGET -q -O /tmp/ispconfig-ai.tar.gz "https://www.ispconfig.org/downloads/ispconfig-ai.tar.gz" >/dev/null 2>&1
+	fi
+
+	if [ ! -f "/tmp/ispconfig-ai.tar.gz" ] ; then
+		echo "Failed downloading Autoinstaller" ;
+		exit 1;
+	fi
 
-rm -rf /tmp/ispconfig-ai ;
-mkdir /tmp/ispconfig-ai ;
-tar -C /tmp/ispconfig-ai/ -xzf /tmp/ispconfig-ai.tar.gz || (echo "Failed extracting Autoinstaller" ; exit 1)
-rm -f /tmp/ispconfig-ai.tar.gz ;
-cd /tmp/ispconfig-ai ;
+	rm -rf /tmp/ispconfig-ai ;
+	mkdir /tmp/ispconfig-ai ;
+	tar -C /tmp/ispconfig-ai/ -xzf /tmp/ispconfig-ai.tar.gz || (echo "Failed extracting Autoinstaller" ; exit 1)
+	rm -f /tmp/ispconfig-ai.tar.gz ;
+	cd /tmp/ispconfig-ai ;
+	INSTALL_DIR="/tmp/ispconfig-ai";
+fi
 
 TTY=$(ps ax | grep "^[ ]*"$$ | head -n 1 | awk '{ print $2 }' 2>/dev/null);
 if [ "$TTY" != "" ] ; then
-	${PHP} -q /tmp/ispconfig-ai/ispconfig.ai.php $@ < /dev/${TTY} ;
+	${PHP} -q "$INSTALL_DIR/ispconfig.ai.php" $@ < /dev/${TTY} ;
 else 
 	echo "It seems you are not using a TTY. Please add --i-know-what-i-am-doing to the arguments.";
-	${PHP} -q /tmp/ispconfig-ai/ispconfig.ai.php $@ ;
+	${PHP} -q "$INSTALL_DIR/ispconfig.ai.php" $@ ;
 fi
 
 cd ${CURDIR} ;
diff --git a/lib/class.ISPConfig.inc.php b/lib/class.ISPConfig.inc.php
index da8ca79a29d2544138dbb31df5b6424840ed4a31..77a3a56c50634c20da31ad246ea9a41285617e1a 100644
--- a/lib/class.ISPConfig.inc.php
+++ b/lib/class.ISPConfig.inc.php
@@ -174,10 +174,30 @@ class ISPConfig {
 	}
 
 	public static function wantsPHP() {
+		// If a new version is added, the getApacheModulesToDisable function should be updated to disable the latest version (this part could be improved)
+		$available_php_versions = array(
+			'5.6',
+			'7.0',
+			'7.1',
+			'7.2',
+			'7.3',
+			'7.4',
+			'8.0'
+		);
 		if(isset($_GET['use-php']) && $_GET['use-php']) {
-			return $_GET['use-php'];
+			if ($_GET['use-php'] === 'system') {
+				return $_GET['use-php'];
+			} else {
+				$use_php = explode(',',$_GET['use-php']);				
+				$php_versions = array_intersect($use_php, $available_php_versions);
+				if(!empty($php_versions)) {
+					return $php_versions;
+				} else {
+					return false;
+				}				
+			}
 		} else {
-			return false;
+			return $available_php_versions;
 		}
 	}
 
@@ -224,9 +244,9 @@ Possible arguments are:
 	--use-nginx		->Use nginx webserver instead of apache2
 	--use-amavis	->Use amavis instead of rspamd for mail filtering
 	--use-unbound	->Use unbound instead of bind9 for local resolving. Only allowed if --no-dns is set.
-	--use-php		->Use specific PHP version instead of installing multiple PHP, e.g. --use-php=7.3 (5.6, 7.0, 7.1, 7.2 and 7.3 available).
+	--use-php		->Use specific PHP versions, comma separated, instead of installing multiple PHP, e.g. --use-php=7.4,8.0 (5.6, 7.0, 7.1, 7.2, 7.3, 7.4 and 8.0 available).
 					->--use-php=system disables the sury repository and just installs the system\'s default PHP version.
-					->CURRENTLY ONLY EITHER --use-php=system OR OMITTING THE ARGUMENT (use all versions) IS SUPPORTED!
+					->ommiting the argument (use all versions) 
 	--use-ftp-ports ->This option sets the passive port range for pure-ftpd. You have to specify the port range separated by hyphen, e. g. --use-ftp-ports=40110-40210.
 					->If not provided the passive port range will not be configured.
 	--no-web		->Do not use ISPConfig on this server to manage webserver setting and don\'t install nginx/apache or pureftpd. This will also prevent installing an ISPConfig UI and implies --no-roundcube as well as --no-pma
@@ -281,7 +301,7 @@ Possible arguments are:
 		} elseif(isset($_GET['lang']) && !in_array($_GET['lang'], array('de', 'en'), true)) {
 			self::printHelp();
 			exit;
-		} elseif(isset($_GET['use-php']) && $_GET['use-php'] !== 'system') {//!in_array($_GET['use-php'], array('5.6', '7.0', '7.1', '7.2', '7.3', 'system'), true)) {
+		} elseif(isset($_GET['use-php']) && !self::wantsPHP()) {
 			self::printHelp();
 			exit;
 		} elseif(isset($_GET['use-ftp-ports']) && (!preg_match('/^([1-9][0-9]+)-([1-9][0-9]+)$/', $_GET['use-ftp-ports'], $pmatch) || intval($pmatch[1]) >= intval($pmatch[2]))) {
diff --git a/lib/os/class.ISPConfigDebian10OS.inc.php b/lib/os/class.ISPConfigDebian10OS.inc.php
index 2c0d4a3a4634f0ffe29b06dfde43a13600fcbcba..b5439d8bc63a14491ca2ea83158b2815836810dc 100644
--- a/lib/os/class.ISPConfigDebian10OS.inc.php
+++ b/lib/os/class.ISPConfigDebian10OS.inc.php
@@ -49,7 +49,7 @@ class ISPConfigDebian10OS extends ISPConfigDebianOS {
 	}
 
 	protected function setDefaultPHP() {
-		ISPConfigLog::info('Settings default system php version.', true);
+		ISPConfigLog::info('Setting default system php version.', true);
 		$cmd = 'update-alternatives --set php /usr/bin/php7.3';
 		$result = $this->exec($cmd);
 		if($result === false) {
@@ -57,7 +57,12 @@ class ISPConfigDebian10OS extends ISPConfigDebianOS {
 		}
 
 		if(ISPConfig::shallInstall('web')) {
-			$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.3 ; update-alternatives --set php-fpm.sock /run/php/php7.3-fpm.sock';
+			// When --use-php-system is used, there is no alternative for php-fpm.sock.
+			if(ISPConfig::wantsPHP() === 'system') {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.3';
+			} else {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.3 ; update-alternatives --set php-fpm.sock /run/php/php7.3-fpm.sock';
+			}
 			$result = $this->exec($cmd);
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
diff --git a/lib/os/class.ISPConfigDebianOS.inc.php b/lib/os/class.ISPConfigDebianOS.inc.php
index 65b9031c5f8d318983d101c3b71589668b1c4f31..8284f914ddd09fb67e9ca319f1ced12b2b507ebe 100644
--- a/lib/os/class.ISPConfigDebianOS.inc.php
+++ b/lib/os/class.ISPConfigDebianOS.inc.php
@@ -102,8 +102,13 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 				'resolvconf',
 				'clamav',
 				'clamav-daemon',
+				'clamav-docs',
+				'zip',
 				'unzip',
 				'bzip2',
+				'xz-utils',
+				'lzip',
+				'rar',
 				'arj',
 				'nomarch',
 				'lzop',
@@ -111,15 +116,12 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 				'apt-listchanges',
 				'libnet-ldap-perl',
 				'libauthen-sasl-perl',
-				'clamav-docs',
 				'daemon',
 				'libio-string-perl',
 				'libio-socket-ssl-perl',
 				'libnet-ident-perl',
-				'zip',
 				'libnet-dns-perl',
-				'libdbd-mysql-perl',
-				'dnsutils'
+				'libdbd-mysql-perl'
 			);
 
 			if(ISPConfig::shallInstall('local-dns')) {
@@ -157,14 +159,22 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 		return $packages;
 	}
 
+	protected function getApacheModulesToDisable() {
+		$modules = array(
+			'mpm_prefork'
+		);
+
+		return $modules;
+	}
+
 	protected function getApacheModulesToEnable() {
-		$modules = array('suexec', 'rewrite', 'ssl', 'actions', 'include', 'dav_fs', 'dav', 'auth_digest', 'cgi', 'headers', 'proxy_fcgi', 'alias');
+		$modules = array('suexec', 'rewrite', 'ssl', 'actions', 'include', 'dav_fs', 'dav', 'auth_digest', 'cgi', 'headers', 'proxy_fcgi', 'alias', 'http2', 'mpm_event');
 
 		return $modules;
 	}
 
 	protected function setDefaultPHP() {
-		ISPConfigLog::info('Settings default system php version.', true);
+		ISPConfigLog::info('Setting default system php version.', true);
 		$cmd = 'update-alternatives --set php /usr/bin/php7.0';
 		$result = $this->exec($cmd);
 		if($result === false) {
@@ -172,7 +182,12 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 		}
 
 		if(ISPConfig::shallInstall('web')) {
-			$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.0 ; update-alternatives --set php-fpm.sock /run/php/php7.0-fpm.sock';
+			// When --use-php-system is used, there is no alternative for php-fpm.sock.
+			if(ISPConfig::wantsPHP() === 'system') {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.0';
+			} else {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.0 ; update-alternatives --set php-fpm.sock /run/php/php7.0-fpm.sock';
+			}
 			$result = $this->exec($cmd);
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
@@ -281,6 +296,15 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 		}
 	}
 
+	protected function addGoAccessRepo() {
+	ISPConfigLog::info('Activating GoAccess repository.', true);
+	$cmd = 'echo "deb https://deb.goaccess.io/ $(lsb_release -cs) main" | sudo tee -a /etc/apt/sources.list.d/goaccess.list >/dev/null 2>&1 ; wget -O - https://deb.goaccess.io/gnugpg.key 2>&1 | sudo apt-key --keyring /etc/apt/trusted.gpg.d/goaccess.gpg add - 2>&1';
+	$result = $this->exec($cmd);
+	if($result === false) {
+		throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
+	}
+}
+
 	protected function installUnattendedUpgrades() {
 		ISPConfigLog::info('Installing UnattendedUpgrades', true);
 
@@ -479,6 +503,10 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 			$this->addSuryRepo();
 		}
 
+		if(ISPConfig::shallInstall('web')) {
+			$this->addGoAccessRepo();
+		}
+
 		$this->updatePackageList();
 
 		ISPConfigLog::info('Updating packages (after enabling 3rd party repos).', true);
@@ -788,7 +816,6 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 					'apache2-utils',
 					'libapache2-mod-fcgid',
 					'apache2-suexec-pristine',
-					'libapache2-mod-php',
 					'libapache2-mod-python',
 					'libapache2-mod-passenger'
 				);
@@ -813,15 +840,8 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 		if(ISPConfig::wantsPHP() === 'system') {
 			$php_versions = array($this->getSystemPHPVersion());
 		} else {
-			$php_versions = array(
-				'5.6',
-				'7.0',
-				'7.1',
-				'7.2',
-				'7.3',
-				'7.4',
-				'8.0'
-			);
+			//ISPConfig::run() validations prevent sending here null values
+			$php_versions = ISPConfig::wantsPHP();
 		}
 
 		$php_modules = array(
@@ -866,6 +886,15 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 		$this->installPackages($packages);
 
 		if(ISPConfig::shallInstall('web') && ISPConfig::$WEBSERVER === ISPC_WEBSERVER_APACHE) {
+			// Disable conflicting modules so mpm_event can be used with http2
+			ISPConfigLog::info('Disabling conflicting apache modules.', true);
+			$modules = $this->getApacheModulesToDisable();
+			$cmd = 'a2dismod ' . implode(' ', $modules) . ' 2>&1';
+			$result = $this->exec($cmd);
+			if($result === false) {
+				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
+			}
+
 			ISPConfigLog::info('Enabling apache modules.', true);
 			$modules = $this->getApacheModulesToEnable();
 			$cmd = 'a2enmod ' . implode(' ', $modules) . ' 2>&1';
@@ -873,6 +902,16 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
 			}
+
+			ISPConfigLog::info('Enabling default PHP-FPM config.', true);
+			$conf = 'php' . $this->getSystemPHPVersion() . '-fpm';
+			$cmd = 'a2enconf ' . $conf . ' 2>&1';
+			$result = $this->exec($cmd);
+			if($result === false) {
+				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
+			}
+
+			$this->restartService('apache2');
 		}
 
 		try {
@@ -998,7 +1037,8 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 				'pure-ftpd-common',
 				'pure-ftpd-mysql',
 				'webalizer',
-				'awstats'
+				'awstats',
+				'goaccess'
 			);
 			$this->installPackages($packages);
 
@@ -1096,6 +1136,7 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 			$replacements = array(
 				'/^\s*\$config\s*\[["\']default_host["\']\]\s*=.*$/m' => '$config[\'default_host\'] = \'localhost\';',
 				'/^\s*\$config\s*\[["\']smtp_server["\']\]\s*=.*$/m' => '$config[\'smtp_server\'] = \'%h\';',
+				'/^\s*\$config\s*\[["\']smtp_port["\']\]\s*=.*$/m' => '$config[\'smtp_port\'] = 25;',
 				'/^\s*\$config\s*\[["\']smtp_user["\']\]\s*=.*$/m' => '$config[\'smtp_user\'] = \'%u\';',
 				'/^\s*\$config\s*\[["\']smtp_pass["\']\]\s*=.*$/m' => '$config[\'smtp_pass\'] = \'%p\';'
 			);
diff --git a/lib/os/class.ISPConfigUbuntu2004OS.inc.php b/lib/os/class.ISPConfigUbuntu2004OS.inc.php
index 8f1d91dbe0bebb83cf7c74898ddd9acc6a458a3f..acc312982960bc4c01a91be94fc510d83686bcc3 100644
--- a/lib/os/class.ISPConfigUbuntu2004OS.inc.php
+++ b/lib/os/class.ISPConfigUbuntu2004OS.inc.php
@@ -99,7 +99,7 @@ maxretry = 3';
 	}
 
 	protected function setDefaultPHP() {
-		ISPConfigLog::info('Settings default system php version.', true);
+		ISPConfigLog::info('Setting default system php version.', true);
 		$cmd = 'update-alternatives --set php /usr/bin/php7.4';
 		$result = $this->exec($cmd);
 		if($result === false) {
@@ -107,7 +107,12 @@ maxretry = 3';
 		}
 
 		if(ISPConfig::shallInstall('web')) {
-			$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.4 ; update-alternatives --set php-fpm.sock /run/php/php7.4-fpm.sock';
+			// When --use-php-system is used, there is no alternative for php-fpm.sock.
+			if(ISPConfig::wantsPHP() === 'system') {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.4';
+			} else {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.4 ; update-alternatives --set php-fpm.sock /run/php/php7.4-fpm.sock';
+			}
 			$result = $this->exec($cmd);
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
diff --git a/lib/os/class.ISPConfigUbuntuOS.inc.php b/lib/os/class.ISPConfigUbuntuOS.inc.php
index edf3e55ce0249f68a8d11973259823cf18d8dc1c..aa7d4135ddcd14d0b467589c33f62432ae9c7a30 100644
--- a/lib/os/class.ISPConfigUbuntuOS.inc.php
+++ b/lib/os/class.ISPConfigUbuntuOS.inc.php
@@ -82,7 +82,7 @@ maxretry = 3';
 	}
 
 	protected function setDefaultPHP() {
-		ISPConfigLog::info('Settings default system php version.', true);
+		ISPConfigLog::info('Setting default system php version.', true);
 		$cmd = 'update-alternatives --set php /usr/bin/php7.2';
 		$result = $this->exec($cmd);
 		if($result === false) {
@@ -90,7 +90,12 @@ maxretry = 3';
 		}
 
 		if(ISPConfig::shallInstall('web')) {
-			$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.2 ; update-alternatives --set php-fpm.sock /run/php/php7.2-fpm.sock';
+			// When --use-php-system is used, there is no alternative for php-fpm.sock.
+			if(ISPConfig::wantsPHP() === 'system') {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.2';
+			} else {
+				$cmd = 'update-alternatives --set php-cgi /usr/bin/php-cgi7.2 ; update-alternatives --set php-fpm.sock /run/php/php7.2-fpm.sock';
+			}
 			$result = $this->exec($cmd);
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');