Mine is doing the same thing as well, I keep getting a popup that says the script is missing. Did you ever figure out what was wrong with it?
The mod comes packaged in .zip archive, which you need to take it out of in order for the game to read it.
Check out this page, make sure you've followed all steps to the dot, especially Step 5. as that's what I guess might be wrong: https://wonderfulwhims.com/installation/