Just installed a script and it's not showing up under Tag Sources

[ohrenkino]

You can complain as much as you want.
The "broken" web sources lead to no useful search results any more. That is the problem.
That what you see in the web sources menu is a list of filenames with the extension "src" from the folder data>sources.
MP3tag does not evaluate any code on load.
You can even put an empty file into that folder and save it with the extension "src" and you will see it in the web sources menu.
So, to sum it up: your idea with the

@jrsousa2

if you place and outdated script in the scripts folder, it doesn't load

is voodoo.

You can see this post

Unable to connect toTag Sources

Also make sure you're using the latest version of Mp3tag. You mentioning an Amazon Tag Source makes me suspicious — the Amazon Tag Source is long removed from the program and the others have seen multiple updates since then.

which describes which reaction you can expect from an outdated web source script.
So if you really want to get down to the source of the problems on your pc it would be a better strategy to recall the way you installed your MP3tag and where it therefore expects the files.