I also think the problem is along those lines. A existing modified script-fu.exe is already installed (somewhere). gimper66's first screenshot shows the dialogue with a scroll bar. All that is needed is re-size the dialogue window.
More worrying is the second gimper66 screenshot. All those folders in user plugins and what looks like a non-understanding of how that works
The folder name must be the same as the plugin and in Windows without the extension.
script-fu.exe goes in a folder script-fu
ofn-bend-path.py goes in a folder ofn-bend-path
script-fu.exe in a folder "script-fu exe 18-02-2022" is not going to work.
This is still not mandatory for Gimp 2.10 but will be for Gimp 3 (when it comes) Makes sense in Windows where there might be lots of dependencies like the gimp_gmic_qt plugin but there are not many like that. Looking at gimper66's screenshot maybe a case for a cleanup
A doc folder ? is there a doc.exe or doc.py plugin ?