WebJunkie: I've downloaded a few updates myself but don't yet own Exile or Revelations on GOG, have all the others, but the stupid update to the GOG Store and Store Front mean I can't search or buy anything at all as I use IE11, so won't be buying those until they fix IE11, if ever!
Exile I own as the original DVD and that still runs 'as is' on Windows 10, been playing that for a few weeks now without any issues, so don't really need to buy it on GOG do I :)
Again, it's strange the Myst website says the 25th Anniversary Collection is available on GOG but the link just goes to the Myst Masterpiece Edition page?