Hi, I downloaded 6R but I want to downgrade to 6Q.. I downloaded the 6Q manual patcher and ran it, now every time I open my LFS it gives me a stops working error when it was working fine on 6R.

Could do something with the fact that Blackwood was changed between these 2 versions. And why would you want to run older version?
Anyway - here's link to version Q info page,there's full installation,should work: https://www.lfs.net/patch-6q

Full version link goes to 6R and I want to downgrade to older version to use tweak.

Seems like gamershell.com doesn't update their library with LFS,so I'm out of ideas here...

Live For Speed 0.6Q is rubbish for tweaks, get LFS 0.6H since it has the most tweaks.