After Save and check in Settings > License, the badge tells you exactly where you stand:
- Valid: all good; Pro is unlocked.
- Invalid: the server rejected the key. Check for typos: the key is 21 characters, letters and digits only, no spaces. Copy it fresh from your purchase email.
- Offline: the server was unreachable, but your key validated recently, so Pro keeps working for up to 7 days offline. Reconnect within that window and it re-verifies by itself.
- Unverified: the server was unreachable and there is no recent successful check. Connect to the internet once so the key can be verified, then try again. If you ARE online, the message names the HTTP status the server answered with; wait a few minutes and retry, and if it persists tell support the number.
Device limit reached #
Your license covers a fixed number of installations. Moving to a new PC? Remove the old device in your account (sign in with the email you bought with, or with product and key), then save the key again on the new machine.