Updated Installation (markdown)

Installation.md

@@ -34,8 +34,8 @@ install the following:
   firewall for HTTPS
 * MariaDB (10.3 or newer); it is also recommended to secure the DB properly
   (set root password etc.) 
-* PHP 7.3 or 7.4 (we have not fixed issues of PHP 8.x yet)
-* Node.js 12.x or newer (14.x recommended)
+* PHP 7.4 (7.3 is no longer supported and we have not fixed issues of PHP 8.x yet)
+* Node.js 12.x or newer (14.x recommended, 16.x not working yet)
 
 A few tips for installing the database:
 ```
@@ -53,7 +53,7 @@ GRANT ALL PRIVILEGES ON `recodex`.* TO 'recodex'@'localhost';
 Configuring the PHP repository:
 ```
 # dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-8.rpm
-# dnf module enable php:remi-7.3
+# dnf module enable php:remi-7.4
 ```
 
 Installing Node.js:
@@ -615,7 +615,7 @@ you have already done this).
 
 ```
 # dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-8.rpm
-# dnf module enable php:remi-7.3
+# dnf module enable php:remi-7.4
 # dnf install php-cli
 ```