https://bugs.winehq.org/show_bug.cgi?id=45972
--- Comment #4 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Zebediah Figura from comment #3)
Ugh, thanks. So this was essentially broken by 9d121203955da5c761cfb5c22b6428278e41f0c7.
Nope, I investigated this as well (sorry for not mentioning it), and I've tested that before this commit the installer didn't work either, but it failed a bit differently. So, it's not your fault this time :)