I bought a new performant PC too I did not face that kind of thinks I could rebuilt my collection but it takes couple of hours with 10mB/s internet connection as I have more than 460cards running new Win 11 instead of 7 .Have you tried at the begining after you loged in into your account to click on syncronize with server option??? ( i.e.click on your avatar and you will see it ). After that my unspend credits and purchased cards apperas at infobar and I only need to download them again! Good luck !
Guys I have now this configuration
AMD Ryzen 5 5600X 6-Core Processor 3.70 GHz
32GB RAm
NvidiaFeforce 1650
Motherboard ASRock B550M Phantom Gaming 4 (1 PCI-E x1, 2 PCI-E x16, 2 M.2, 4 DDR4 DIMM, Audio, Video, Gigabit LAN)
It works like an F16 fighter
Wish you all the best