When searching for an "offline activation file," you may encounter websites claiming to offer "cracked" versions or unofficial key generators.
Your subscription is tied to a specific minor version (e.g., 4.21). You installed Metasploit Pro 4.22. Solution: Offline licenses are version-locked. Download the exact version installer from the Rapid7 portal that matches your offline activation file generation date. You cannot upgrade an offline machine without a new activation file. Metasploit Pro Offline Activation File