https://bugs.winehq.org/show_bug.cgi?id=52362
--- Comment #5 from Rafał Mużyło galtgendo@o2.pl --- (In reply to Louis Lenders from comment #4)
As far as I understand, Staging has a patch for that bug, but Staging doesn`t allow the installer to succeed as well :(
If you're referring to the mentioned in the bug, ...well, if (as it seems) it's still generates the sortkeys based on DUCET, it's likely still getting things wrong. The way I very vaguely recall it, one of the later Fabian Maurer's patches generated the keys based on MS data, but I'm not sure if the version in staging does.
Of course my guess on the reason might simply be wrong, though did you see those CompareString calls before entering that endless loop ?