Hi guys!

Recently returned to the game of games, to find a big update had taken place. Lovely stuff to be certain, but now I can't get any of the mods to work that I used before. I have pretty much all DLC installed, including ROTS and FOTS.
To be clear: I am a total mod noob. I use mods other people release, and alter those as I see fit for personal use. That's the only way available to me to alter game files, 'cause like I said; I have no idea how to make a mod myself.
I have the latest version of the PFM installed as well as .NET framework (4 or later I believe), but everytime I alter one of the old mods it gets a 'lock' symbol added to its symbol. Plus, the game crashes with certain mods installed, so now I use no mods to be safe.
If anybody can help me on my way to a solution so I can start altering unit stats and whatnot, I'd be very greatful!

Thanks in advance!