I have had a folder holding seperate runtimes since Poser 6 and that folder is backed up on a regular basis.  Although it has grown in size the same folder has been used across 3 systems and every upgrade in Poser since Poser 6.

If it is a new system or a new install all I do is load the folder and the link each runtime to the new Poser installation. With the exception of the odd individual item I have never had to return to the site I have purchased my data for a further download.  In fact I have all the downloads backed up anyway.  If you have a good back up procedure I do not see the need for bulk downloads.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.