Well in my case it´s pure coincidence that my “only valid version” also happens to be the “original” objectivly because it was the first one to be released. I can absolutly understand anyone who played the enhanced version first and is appauled by the looks of the early Commodore versions. I won´t argue about the music though, that one is objectivly better…
Oh yeah, there is lots of stuff that is really stupid in hindsight. I used to like a C64 called “Game Over” and looking at it now I simply have no clue why.
But as I´ve said I will admit that the FM Towns version of Zak is really really good and possibly the definitve one, there is possibly a reason for it being the version that is on GOG now.