Im trying to do this. Nothing has worked though, including using the versions of the software in AI suite which were current at the time the Sabertooth X58 was new (Fan xpert 1.00.13, not fan xpert II, pc probe etc) and trying compatability mode etc.
Not much of a solution, but you could possibly try with an XP or windows 7 emultaor (I think they supported 7). At least for testing purposes that might be of some use. I think installation fails because of the OS, not the board, because I know from an overclockers.net review of the board that old versions do work with the board..