https://bugs.winehq.org/show_bug.cgi?id=39712
--- Comment #2 from archee@tuta.io --- Hey, thanks for trying it out too.
It does the same for me with the Next button, but it crashes when you hit Cancel. And it still does it in 1.9.6 =(
I found this thread with some more info: http://www.airdcpp.net/forum/viewtopic.php?t=4315
I did some experimentation after reading that and tried setting the version to Vista in winecfg, and it actually worked!
So, to sum up:
Vista -> installer -> success -> setup wizard -> success Win7 -> installer -> success -> setup wizard -> crash -> revert to WinXP and run main application -> success WinXP -> installer -> not supported
This should help narrow down the issue, but at least there is a workaround now.