Log in today see big update, install it, go to DK1, see the whole graphic settings are seemingly gone, so I check for updates. Now the game only launches with default settings and there's nowhere to change it. Try to update it again, update fails at 96%. Uninstall and now installation fails at 96%. I can at least install the offline version, but the online one won't launch because it keeps failing at the 96% update.

That's all not to mention that there's no Windows version anywhere and that used to run smooth with the "non-pixely" graphics for me back in like 2009.

Pressing Alt+R while in the game (playing an actual level) most likely will fix your "pixely-problem".

That said, using KeeperFX is the way to go.