For IWD/HoW, the final patch is included in the Trials of the Luremaster free download (available
here). All you need is TotL and you're set. Installation order is IWD, HoW, TotL. No patching needed beyond that.
My version of IWD2 (from the Ultimate Collection, bought at least a couple of years ago) needed a patch, v.2.01, I believe. I think I got it
here.