Payment is a one-time fee per major version, not a recurring subscription.
If you need help (for simulator features), or if you want to know the current upgrade price for your specific version, I can look that up for you. SCARM - General Discussion - Hornby Hobbies Community scarm license key new
Ensure SCARM is not being blocked by your Windows firewall, as it needs to verify the license online during installation. Payment is a one-time fee per major version,