I think there is a way around that... but maybe it does not work with V4.... I got some carts from DAZ3D for a project and I did not need to install DS.  The issue maybe that the recent items I purchased were not DAZ3D products, but vendor items.

With that said... Did you get your files put on Disc, or did you purchase them on a disc?  I just checked and my old downloads in my account are still there, all 432 Orders... I know a few are missing because the items ran afoul, but they should still be there.

DAZ3D items in the past used non Poser format for the ZIPs and some were installers. This created some issues with adding to Libraries, but their were ways... Maybe someone more verse in DAZ3D current formats can offer a solution. 

Well.. that is what I get for double checking that what I said about DAZ3D was still true and not typing my email correct, so I think I forgot my Password, and then had troubles accessing my WebMail for the account.... three people respond....

ratscloset
aka John