https://bugs.winehq.org/show_bug.cgi?id=48044
--- Comment #3 from Daire daire.byrne@gmail.com --- Yea so I think I had confused myself slightly. I had a 64bit wineprefix but was essentially using "winetricks python27" with wine -> wine32.
Either way, the installer works fine with 32bit and fails with 64bit. This is the case for 4.0.2 & 4.18 staging.
Daire