When you download my script, it consits of two parts: the export & action script files (mta & mte) and the Discogs Pone Web Script Settings.mp3 file.
When you update the script, you have to overwrite the old mta & mte files with the new ones, but you have to keep you old Discogs Pone Web Script Settings.mp3 file and delete the new one.
When I make a new update, sometimes I change some things in the Discogs Pone Web Script Settings.mp3 file (new options, new fields). This is done with the Discogs Pone>Update Settings Mp3 File action.
The new web sources scripts (src files) are created with the Discogs Pone>Create Scripts action. But only if you draged the mte & mta files from the lastest update in the correct folder, and if you updated the setting file with the action before.
(Acctually, the Discogs Pone>Update Settings Mp3 File action is not necessary at every update, and never for the first installation, but to avoid confuseness, I just included it as a regualar step in the instruction).
Tagging close to perfection is difficult, almost impossible. When it comes to composer, or the involved musicians, there is no database which has it all. Even the CD booklets don't hold that information in all cases.