I installed this mod just this past week, and I finally got it to work!!!
When I had installed it the first time, I downloaded the package file only. If I remember right, the trait was available in CAS, but the “Actions” didn’t show up when I had my Sim try to perform them. So I installed the script, but I didn’t install it properly. The script seems to consist of two files, a .py and a .pyc. I downloaded each of these (separately) into my Mods folder - which is wrong - and still couldn’t put the trait to use.
So finally, last week, I re-downloaded both the package and the script files into my mods folder. I downloaded the script as is, which is a .ts4script file. It’s finally working, and I’m loving it!
Maybe I’m just not giving it enough time, but I’ve found I’ve needed to hit “Save” every few minutes of playing in order for the effects of the “Weight Powers” actions to actually manifest…