When I installed Gape's Unofficial SP2 there were no problems with my system. It appears that SP3 - B4 really is Gape's final version. I always keep a very clean backup available, in case something goes horribly wrong during a major upgrade. SP3 - B4 must have been scoured for bugs hundreds of times. Is SP3 - B4 essentially bug free and safe to install? I know that's a difficult question answer, since every pc has different hardware and software. I don't expect a simple "yes" or "no" reply. If you're very familiar with SP3 - B4 and are 95% sure this last service pack is safe, that's more than good enough for me!