Your subscription period has ended. MobaXterm Professional includes one year of updates. The file remains valid only for that year. After expiry, the software reverts to Custom Edition but still runs. You must purchase a renewal (you get a new Pro.key file).
This is where the user experience varies. There are two ways the "key location" is handled:
Right-click Pro.key → Properties → Security. Ensure your user account has "Read" permission. Without read access, MobaXterm ignores it. mobaxterm professional license key location
If you placed the file correctly but MobaXterm still shows "Custom Edition", try these fixes:
First, a crucial distinction. When you purchase MobaXterm Professional, you do not type a 25-character "key" into a popup window. Instead, you receive a Pro.key file (usually via email from the reseller, like Gumroad or the official Mobatek store). Your subscription period has ended
Therefore, searching for a "license key string" is futile. You must locate the file itself.
To move your MobaXterm Professional license: Therefore, searching for a "license key string" is futile
Security Warning: The
Pro.keyis not bound to a specific machine. Anyone with your key file can activate Professional on their PC. Treat it like a password. Do not share it, upload it to GitHub, or send it via unencrypted email.