ofnuts

SourceForge only accepts open-source projects so implicitly this is an open-source. There is a GPL3 licence in the Python files. Added a LICENSING file

As stated in the download page: These scripts have been written for Gimp 2.x and will not run on Gimp 3.x. Those that are converted to run with Gimp 3.x can be found here. So the script runs on Gimp 2.10 (and isn't available for Gimp3 yet)

Solved if you use a Gimp packaging that includes Python (flatpak or some AppImage) or can reinstate Python v2 support on your Linux. Windows is unaffected, by the way.

Yes, everything seems fine. A possibility is that the .py file got damaged (if you check it in an editor, the editor can replace spaces by tabs and vice-versa and Python doesn't like it. So when the plu-in is run for registering, it crashes,the registration doesn't occur, and the script isn't added to the menus. So maybe re-extract the .py from the ZIP and love it to the directory without looking inside. You can also start Gimp with gimp-console.exe and see if there are any nasty Python messages...

Things a re bit complicate in Linux? Gimp uses an old Gimp version that has been dropped by Ubuntu. It can be reinstated (see this) or you can use the flatpak version from the Gimp site (comes with its own Python).

Things a re bit complicate in Linux? Gimp uses an old Gimp version that has been dropped by Ubuntu. It can be reinstated (see this or you can use the flatpak version from the Gimp site (comes with its own Python).

The first thing to do is to check that you have a working Python support in Gimp (if you have there is a Filters > Python-fu > Console menu entry. Installing other Python runtimes in Windows can break the Python runtime Gimp (Gimp mandates Python 2.7, and possibly only the 2.7 it comes with). Your Python3 could be ahead of it in the PATH and so mask the good one. I can likely be fixed by tinkering the PATH for the Gimp shorcut.

What is the OS?