I have been trying to set up some minecraft mods for my friend but for some reason every time I run the forge installer, the new forge version doesn't get added to the client. In the past we have done mods together and he has been able to do them just fine but now now matter what version of forge I try to install for him, it doesn't change the installation from 1.15.2 because that is the last version we used. What can I do to fix this?