Hello tomasz,
I FINALLY figured it out!
With the release of Lion, the User library is hidden by default. Type (or copy/paste) the following into terminal and your user library will no longer be hidden:
chflags nohidden ~/Library/
Now unhidden, I found 'Thea4SU_files' & Thea4SU_loader.rb, I removed them, opened a previous version of SU 2013…
IT WORKED. I updated to the last update and it's stable.
Thank you. However, this problem was unique with the default settings of OS 10.7.5 on a Mac Pro. It's rare because it is the last OS version support on the MacPro, but not designed for this system. Actually, because SU 2013 does not support previous OS versions… and that the MacPro can't support any version of OS above 10.7.5… I got stuck in a crack that most would not be in.
I am so pleased. Again, thank you.