Hi Graechan.I am very happy to see you back on the forum.
188 procedures have changed between 2.6 and 2.8.
207 procedures were changed between 2.8 and 2.10.
Some changes are just a different name - but a dozen have a different number of arguments and their scope.
When repairing old scripts, it's a good idea to run Gimp in --verbose or --console-messages mode and check the build of new procedures one by one.
Some problems can be fixed using the Tin Tran plugin:
https://gimplearn.net/viewtopic.php?f=3 ... onstantize.
Kevin's offer, however, is the best.