Hey guys, I was searching a way to create a forum with ClassicPress because I enjoy it much more than Wordpress.
I was thinking about bbPress, but it seems like it requires Wordpress 5.0 now and I think it will require higher versions in the future.
So, after searching a lot, I’m happy to say that I found a company that creates a awesp,e theme for forums!
Their EngineForum theme is compatible with ClassicPress and it should be compatible in the future as well I guess.
So, just creating this post to help anyone wanting to create a forum with ClassicPress 
That is it!