Skolia: It appears to just be Divinity: Original Sin 2
Gydion: Nope, it's a bunch of games. It seems to be a
backend Galaxy issue:
Galaxy API has issues when trying to get download link using the "downlink" url from product details json.
I'll use Jotun Valhalla Edition as an example because I tested this with the official GOG Galaxy client but the issue is wide spread and affects multiple games
...
This causes the backup feature of the official GOG Galaxy client to fail due to "server error"
Gydion: Until GOG fixes it you can download via the website, GOG Downloader or third-party downloader.
Yuck, well here's hoping they fix it soon.