As bad as the 500px plugin was, it is now completely unsupported and will not install on Classic 7.1. Is there any hope? This was an important workflow for me. Among all the other new problems like a completely useless import, this is near the top of the list.
Windows 10, ver 21H1 with all latest patches. Intel Core i7 (6700), 32GB, SSDs where it matters (system disk: Samsung 950 NVMe 512GB, photo storage: Samsung 860 EVO 2TB), nVidia 2060 Super, 8GB. Raw images are mostly from Sony A7Rii and A7riii (42 Mpix) and A7C.
Mac Mini M1 (2020) latest Big Sur, 8GB/256.