Every mod I download doesn't work. It just reopens the game. I check to see if they're all in the mods folder, and they are. There isn't even a tab at the main menu that says "Mods". I have tried this with several mods, both on Simpleplanes.com and on the workshop, but they don't work.
UPDATE:
It worked once, after I deleted all if my saved planes and sub-assemblies.
ANOTHER UPDATE:
It's back to not working after I add them all in. Also, my SP stopped working before, and Andrew showed me how to fix it. He told me to rename the folder Simpleplanes to Simpleplanes.BACKUP. That worked. It also made the mods that I had installed before work, somehow. So I tried that method, as well as saving my backup data. But as soon as I put all of the saved planes and sub-assemblies in their right folders in the newly created Simpleplanes folder the mods didn't work.