Very interesting. I must look again later today, but I did indeed find that my windows 11 Professional fully updated PC couldn’t access my Core downloads folder, but I eventually discovered that it was ok if connecting my PC to my home network by Ethernet, but didn’t work using WiFi. Before I discovered the Ethernet angle, I had to resort to using my MacBook Pro which worked fine (but was a bit clunky for some reason).
I did try that on mine a few weeks ago, but it still didn’t allow me to connect to my Core downloads folder using WiFi. I checked this morning and I can still connect by Ethernet. But my PC doesn’t want to tell me which update I currently have in place. It is however apparently up to date as of this morning.