Bona

Thank you for your assistance. The problem is solved by a (second, more thorough) reinstall of the software. Anti-Ransomware is activated now.

Same problem as already reported by Pinosempreverde here. Message: 'Your license failed to activate'. Clicking 'Start Protection' does not change a thing. Tried to adapt the hosts file and to exclude MB3Service / mbarw.exe in the firewall, but to no avail. I noticed that Anti-Ransomware worked just fine a few days, but that this failure occurred after last (major) Windows 10 update.