1 the license key applies only for purchases directly with us, Mac, Windows/Linux;
If you purchased from the Apple Mac App Store, you do not have a license key, reinstall from your Apple account at the App Store;
2 there are separate license purchases for iOS, Android, Mac and Windows/Linux;
3 to recover your license key, click Lost your license key link in the trial window;
4 very old Macs might have different license keys (Mac purchase from us), contact us directly at support with your Mac OSX version.