[majormajor]

When I tried last fall, I was able to buy Total Annihilation on GoG on Windows 10 client, but unable to launch the game on Windows 10. That was rather disappointing - no messaging it would be broken before purchase, no insight into if it would ever get fixed.

[metasaval]

In instances like those, they'll refund you. I haven't had to do it myself, but I understand that to be the case. Since they sell a lot of old games, some of which they have to actually use cracks to disable the DRM on, they don't always work on newer machines unfortunately.