Much thanks for your reply! But just in case allow me to get the details...
So I downloaded the FourPlay mod which is a pak, and it doesn't even require a folder. All I had to do was drop the pak into Data folder. In this case, all I still need to do is just follow your instructions to the letter, and not touch the pak itslef, or do I need to move the pak itself into the newly created folder?
Since you said the mod will not work with old save files, there isn't any way to see if the resist caps are working properly right out of the box is there?
The pak stays wherever you have it. You manually create the (empty) folders, drop in the txt from this mod, and that's it.
I said that the mod will not work with old save files unless save-game editing is done (the method of which I posted a few posts above).
That being said, if your save is already using FourPlay then you shouldn't even need to do that; just place the txt file into the empty folders you make for the mod and load up the game, and it should be in effect. If it is not, then that would hint towards MaxResistances being set at the start of the game.