I have the normal TSF and 1.20 version of JJ2.
I used the plusifier to install JJ2+ on my computer, worked great.

However, I tried to install the JJ2+ patch on my friends computer, but it fails to patch his .exe because he has "Jazz Jackrabbit 2 TSF:JK Avalon" version.

What is this version, and how to fix the problems?