When I upgraded to 11.1, it didn't provide anyway to do an in-place (patch) update. I figured that it was a semi-major release, and maybe this was on purpose.
However, I just ran check for updates with 11.1.1 and it still only gave me a link to download the whole application.
Updates used to work fine, has something changed? Is there possibly something wrong with my setup? The only odd thing about my setup is that I install IJ to /Developer/Applications instead of just /Applications.