AFAIK if you started with 1.2.x series you cannot downgrade to 1.1.x - you will have to start the forum over. Is it worth it for a style that is no longer being supported? Personally I don't think so.
There is a version posted earlier in the thread (
here and
here), but you will have to support it yourself for any problems as the person who did the fixes will not provide any.
It IS incompatible - and the only support you get is if someone on the forum posts a fix - and most don't want to have to mess with a style that is not responsive - and will take a LOT of work to get it there.
To fix a lot of the problems you will need to review the thread (starting around page 73 or so) and see if those fixes apply to you.