I´m having the same problem, My Roon Core won´t update. I use a mac mini, OSX 10.13.6 (17G65) for the core.
I have split your post to better assist here. Can you please try rebooting your Core + Networking Gear and try again as the first troubleshooting step?
I already restarted the computer, are you suggesting i restart the router aswell?
Please reboot both your Core and Router to see if this helps.
Is there a way to reboot the Core without rebooting the computer?
I have just rebooted the router, no change in the update.
You can reboot the Roon App on your PC but rebooting the PC itself may help more than just the app.
A post was split to a new topic: Mac Mini “error checking for an update” (1.6)
A post was merged into an existing topic: Mac Mini “error checking for an update” (1.6)