Common Messages Explained
"This license is already activated on the maximum number of devices."
Your license is valid, but you've reached its two-device limit. If you want to move your license to a new computer, contact support (see Getting support). There is no self-service option to deactivate a license.
"Reconnect to verify your license"
Your machine hasn't been able to reach the license server for more than 7 days. This isn't an error with your license itself - simply reconnect to the internet and reopen the app, and it will verify automatically.
"Activate a license"
No license has ever been successfully activated on this machine (or the license key that was tried has never been valid on this machine at all). See Activating your license.
"Can't reach the license server, and there's no earlier activation on this machine to fall back on."
You're offline, and this is either the very first time you've tried to activate on this machine, or you've entered a different key than the one previously used here. Check your internet connection and try again.