> In fact I have modified the bat to add a "lib2" folder where I can easier manage extension jars.
>
> set CP=%MAIN%/BaseX.jar;%MAIN%/lib/*;%MAIN%/lib2/*

Good point. For the Windows executable, I thought about adding a
'custom' sub-directory in the lib folder. The jars in the lib
directory could be deleted with each update, but the custom folder
would be preserved.

> But is the original problem a bug?
> That is after installing the jar via REPO install t:new("aaa") fails although it works when added to lib/

Be sure I’ll check this out later this week.