thanks！

Ok I figured it out. If you install steam and the game with the default path (on windows, sorry other folks), this mod shows up in:

C:\Program Files (x86)\Steam\steamapps\workshop\content\262060\3160705190

Inside that directory, there are multiple folders. Three for each of the modifications, and then an "inventory" folder. The "inventory" folder defaults to the 3x, but you can simply overwrite the files in "inventory" with the ones from whichever version of the mod you want.

Same procedure for the resell mod. For me, it was located in:

C:\Program Files (x86)\Steam\steamapps\workshop\content\262060\3160709390

And it's just one file you need to replace in the "inventory" folder there.

Where are the additional files and how do we swap them out?

How do we use the additional files for 10x or Unlimited stacking? Where are they?

but where?