Alright, I've been struggling with this for 6 hours now and thought it was time to ask for some help. I went through all "The requested resource was not found" discussions, but still couldn't fix the issue.
My homepage works fine, but when I try to post a discussion or go to another page, I am getting an error notification at the bottom left. I guess it's the rewriting. The thing is, I'm not really familiar with the whole Composer thing. Not even sure how I managed to get the system to work on cPanel. Is there a way to fix that? And yes, I have followed all the instructions.