I had a couple of suggestions for the content store and marketplace.  Not sure if it's possible, but I figure making a suggestion can't hurt.
1.  Note by price tag on items I already own to prevent buying a duplicate
2.  Bulk download option
3.  Wishlist to keep track of items I want to buy when I have time, or to keep an eye out for a sale
4.  Wishlist for developers to get a notification of new releases by that creator.

I think this would be helpful and useful.

One other point:  Adobe will end support of flash player on December 2020.  A lot of older iclone content uses flash player to show images and animations for what's in the content pack, and without flash player working properly (even now, chrome doesn't work well with flash player) it's difficult to see the samples and media.