Hi Gunter, starting with version 4 you can install the scripts to the Moi appdata commands folder instead of into the installed program's commands folder.

When you do it that way you won't need to re-install with new versions.

There's some more detailed info here:
https://moi3d.com/faq#Q:_How_do_I_install_a_plug-in_script.3F

- Michael