Various versions on that post, probably version 3 is ok, but...it is packaged as old style script-fu + the single .exe plugin. It will work but it is not correct.
They are all plugins and go in their own folders in the Gimp 3 plugins folder. ( as shown here https://www.gimp-forum.net/Thread-Resynt...ows-Gimp-3 )
see: https://github.com/bootchk/resynthesizer...r3-Plugins
The most obvious - what-have you-done - is the entry bottom of the filters menu. From the error messages the heal selection plugin does not find the resynthesizer plugin. That entry is usually found in Filters -> Map -> Resynthesize.. At least it has for the many years I have used it.
They are all plugins and go in their own folders in the Gimp 3 plugins folder. ( as shown here https://www.gimp-forum.net/Thread-Resynt...ows-Gimp-3 )
see: https://github.com/bootchk/resynthesizer...r3-Plugins
The most obvious - what-have you-done - is the entry bottom of the filters menu. From the error messages the heal selection plugin does not find the resynthesizer plugin. That entry is usually found in Filters -> Map -> Resynthesize.. At least it has for the many years I have used it.