Weird issue.  So I bought BigBoss' overall and coveralls pack. It can be found here: https://www.reallusion.com/ContentStore/Pack/coveralls-and-overalls?utm_source=Character-Creator-3&utm_medium=ap&utm_campaign=smart-gallery&utm_term=UserInventory

And it will NOT install no matter what I do.

 First I thought it was Smart Gallery being buggy, so I used RLdownloader which CORRECTLY downloaded the items:

But Smart Gallery will not load the packs into CC3 for some reason. What am I doing wrong?