Updating NAS server version made the client unhappy

Being a happy user for several years with a quite simple setup: Synology NAS with VH server license serving a single Win10 client.
Client version is v4.9.7, running as a service. After updating the server from v3.9.4 to v4.1.1, the client now is unhappy, telling me that he can only connect to licensed servers. Does the v4 server require a new license key?

Synology packet manager disallows downgrading the package, so right now I am somehow lost and appreciate any support.

Best regards,
Udo Keller

#2

You should be able to upgrade for free without trouble, but it seems like the serial might have changed for some reason. Anyway email me mail [at] virtualhere.com (mail[at]virtualhere[dot]com) and ill resolve the issue