(8 hours ago)ajax Wrote: ..snip...
Per your saying the scripts and plugins from GIMP Version 2 don't work on GIMP Version 3, I have verified that the ones I've been using which do show up on Version 3.0.2 can also be opened. This includes a script referred to as Arrow, and the GMIC plugin. How well they work might take a little time to determine.
A bit more about scripts and plugins and where they go. (using the current Gimp 3.2.x)
A script-fu such as arrow_V3.scm (the V3 is a give-away for Gimp 3) is strictly script-fu and goes in
C:\Users\"yourid"\AppData\Roaming\GIMP\3.2\scripts. (not going to write all that again, just the end)
Increasingly common are script-fu which are plug-ins. The script starts with a shebang #!/usr/bin/env gimp-script-fu-interpreter-3.0 An example of this is the popular plug-in-heal-selection.scm which has to follow Gimp 3 rules and resides in its own folder plug-in-heal-selection in the plug-ins folder ...\GIMP\3.2\plug-ins.
The same applies to python plugins and executables (such as resynthesizer.exe). Drop the extension ...py or .exe and put in a folder of the same name in ...\GIMP\3.2\plug-ins For linux make the scm / py / binary file executable.
The only plugin I know of with an installer, is gmic_gimp_qt https://www.gmic.eu/download.html
Big labels there for versions. The Windows installer is very good, there is also a zip alternative, just be careful about manual installation
Edit: There is another class of "plugin" which you might come across, a GEGL filter. Typically something.dll (Win) or something.so (linux) and these go in
C:\Users\yourid\AppData\Local\gegl-0.4\plug-ins (Win) or ~/.local/share/gegl-0.4/plug-ins/ (linux)
Arrows Lets give CMYKStudents MyPaint Arrow brush a plug