As per discussion:
https://www.discogs.com/forum/thread/5444a5...ba9e8171880b347
If you go in to your .src files and change 'http' to 'https' so, using the '&discogs#Search by Artist + Al&bum.src' as an example, the script reads:
[IndexUrl]=https://api.discogs.com/database/search?type=release&per_page=100&artist=%s
[AlbumUrl]=https://api.discogs.com/releases/
Pone successfully connects to Discogs.
Edit: Making sure [UserAgent]=1 is added below the [SearchBy] command.