Quote:...And I presume updates overwrite old versions to the same folder....
That is a dangerous assumption
I just tried that script, works fine Gimp 2.10.32 / Win 10
210_edges_vignette.scm goes in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
If you updated to Gimp 2.10 from an earlier Gimp (say 2.8) there might well be old scripts and plugins migrated over by the Gimp 2.10 installer. Worth checking for other versions, There might be something in C:\Program Files\GIMP 2\share\gimp\2.0\scripts but be careful.
Quote:...I will uninstall and reinstall clean and see what happens...
That very rarely fixes anything. Your Gimp profile C:\Users\"yourname"\AppData\Roaming\GIMP\2.10 remains untouched.
A better way is rename that to (say) C:\Users\"yourname"\AppData\Roaming\GIMP\2.10-backup
Start Gimp which makes a new default profile. Put your script in that.