DragonLite_HD

So I wanna play minecraft with a friend in version 1.15.2. We already have set up a server and everything, but as I wanted to install forge for him, I noticed it was completely different to the old versions and the way I did it before doesn't work anymore, so how does it work now? And before you say "You could just use the normal installer", it doesn't work with my friend's PC.

You can create folders named after the version (e.g. "1.7.10" or "1.12.2") in your mods folder, then forge only uses the mods from the respective folder. (e.g. forge 1.12.2 uses the mods in the folder named 1.12.2).