The Final Mod Pack will not work properly without yesterday's nightly, since there were changes in the vanilla game (most prominently, renaming research). So I would have to stick either to the basic 1.0 or the nightly, and I settled for the latter for a number of reasons.
Therefore, updating to the nightly - not necessarily the latest one, but at least one that is indicated in the readme - is crucial. Sorry about that, but on the other hand, what's the problem with this? I update my OpenXCom daily.