Acronis Backup 12.5: server subscription license is not valid on virtual host after upgrade from v.11.7

Symptoms

1. You have been using Acronis Backup 11.7 for Server Subscription or Acronis Backup Advanced 11.7 for Server Subscription on a virtual host (VMware, Hyper-V, etc.).
2. You have received a free upgrade to Acronis Backup 12.5 Server or Acronis Backup 12.5 Advanced Server.
3. This license is not accepted for backup of your virtual host.

Cause