@ZeRen
not really important anymore since you managed to install the game using Steam.
but that Steam error is related to some Wine versions that don't work with Steam completely (i mentioned this in my guide btw). then i suppose you installed Wine 3.18 from the unofficial "gallium nine" repository which worked with Steam fine. right?
what is your Wine version right now?
$ wine --version
edit:
oh just checked and the gallium nine + wine guy has updated his PPA today, it contains Wine3.20 now. let's hope it wont screw up things. lol
https://launchpad.net/~commendsarnex/+a ... u/winedri3