They better not delete my unreal games in my catalog
Wouldn't be the first time they delete stuff from your library.
Just fairly recently they consolidated the Wolfenstein 3D and Spear of Destiny installers - and in doing so nuked the two Spear of Destiny mission packs (Ultimate Challenge and Return to Danger) from people's libraries. When made aware of this, gog support was basically "lol, ask Bethesda about it".
That's not how it worked before - so just to check I've found separate Spear of Destiny product in my library - and installed it. Launcher offered me option to run:
1) Spear of Destiny
2) Ultimate Challenge
3) Return to Danger
4) exit program
Files from mission packs are definitely installed on the disk. So either they've already fixed it - or it was not happening for everyone.
One thing that they've been definitely doing - is making changes to the product for all
new customers according to publisher wishes. People who bought game earlier always have access to the original version.
So when publisher announces superior, remastered version, either:
- original version is offered as a free bonus to anyone buying a remaster,
- remaster is offered for free to anyone already owning the original - as separate entry in library,
- or it may be the last opportunity to buy original release on GOG and keep it in your library.
And you never know beforehand.
At some point they've promised to implement 'wayback machine' - so you can go back to any version (incl. any patch version) that was available from the moment you've bought the game. But I don't think that they've delived on that promise yet.