Buy Cubase10pro to Cubase11pro upgrade package, in the case of ensure smooth network fill in open eLicenser with activation code upgrade, prompt unable to establish connection with the license server. This might be due to incorrect network Settings, or license server is currently unavailable. Please check your computer’s network Settings and try again later. If the old unresolved issues, please contact your dealer support software department.
See this announcement please:
https://forums.steinberg.net/t/license-server-outage-lizenzserver-ausfall/732783?u=steve