So I got a weird problem. right now I can instal two versions of Ion Maiden.

Ion Maiden - DEMO, it runs fine and has everything upto the "Heskel's House of Horrors" update.

Ion Maiden, this only ever gives me a INSTALLATION BROKEN message and then tries to reinstall.

Anyone else run into this problem?

GOG oops'd the split of these releases. Somehow, I got an entirely different experience and I can run the "ion Maiden"[sic] release just fine :|

Ion Maiden Demo is update 2, which was the last full release of the preview campaign.

Ion Maiden is the early access (well, In Development as it's branded on GOG) has update 4 that features both the preview campaign and a mission shown at PAX East. You'd only really want the latter now anyway, so back up your saves, uninstall whatever you have and just install the latest one.

Well that is weird. Mostly it is fine for now was I can play with all the stuff that has been released.

Mostly it is buging me becouse the "main" game is trying to reinstal itself from time to time while I play Heroes of Hammerwatch.