If we already purchased a game that currently is not compatible on one's operating system, when they are compatible, we wouldn't need to purchase them again, correct?
The fact that we purchased the game once (located in our profile) would simply require another download for the new compatibility?
I believe it is in GOG's best interest to update the games in their catalouge so that they work on the newest systems. It wouldn't make too much sense for them to charge people double who just happend to buy it earlier then somebody else did. :)
Once you buy a game, it is yours, and you can download it as much as you want. I, for instance, redownloaded Heroes of Might and Magic 2 since a new version came out last year here....Now, there is always a chance that the game will be pulled due to some legal matter (ie: game rights being sold to someone else who won't make another deal with GOG), but, since there is no DRM you can always keep what you downloaded. GOG, unlike most other digital download companies is not in the bussiness of ripping off people, and "renting" you game licenses. Welcome aboard Goethe and have fun with Your good old games! :D