After the update to Lightroom Classic CC on both of my systems I am not able to import from the catalog on the other computer via ethernet. I get an error message that the external catalog seems to be a non valid Lightroom-catalog. On the other computer the catalog works.
I run Lightroom on an iMac and a MacBook. Usually I import pictures to my MacBook to sort and develop them - for example when I am traveling. From time to time I use the functionality "import from another catalog" on my iMac to get the new pictures from the catalog which is stored on the MacBook via LAN/WLAN. In the previous version this was working fine. Since the update to Lightroom Classic CC I see the error message above.
When I copy the catalog and the negative files from my MacBook into a folder on my iMac I am able to import them into the iMac catalog. So the issue should have to do with access via network.