I tried the tool but it doesn't work:
"Unknown Jazz version or failed to detect" (I had TSF installed Version 1.24).

But then I remembered, that I've also the normal Jazz Jackrabbit 2 CD an then I installed the normal Jazz Jackrabbit 2 (Version 1.20). Then I clicked on the patch, that will upgrade the version to 1.23, but then this error message appeared:

I've reinstalled it two times, but it doesn't work.
Where's the mistake ?