03 May 2023 17:11, you wrote to me:

Looking at the commit history, there should be no differences between
the forks regarding 64-bit compatibility. Commits from the larsks repo were merged into the ftnapps (Clay / Debian) repo and the additional commits punktniklas are mostly build warning fixes. I haven't tested
the other versions and might have missed a critical bug fix that has
not been mentioned in the commit logs.

FYI, I found another separate fork:
https://github.com/orignal/crashmail

The README states:

This forks fixed incompatibity of JAM database with GoldEd+

Carlos

--- GoldED+/W32-MSVC 1.1.5-b20180707
* Origin: cyberiada (2:341/234.1)