"License key is not valid for this version." Why: Your maintenance subscription expired. A major UPD (e.g., 8.x to 9.x) requires an active support contract. Fix: Login to your GFI account. Renew maintenance or revert to the backup configuration on the old version.
If you want, I can:
She re-uploaded 9.4.2, paused at the "Applying rules" step, executed Liam’s script via SSH (which manually renamed the duplicate chain), and then hit Continue . This time, the console showed: "Success. Firewall active." kerio control 942 upd