When you purchase SwitchResX, the serial number is sent to the email address you used during checkout. Search your inbox for "SwitchResX" or "Madrau." Inside the App: If the software is already registered on your Mac, open System Settings (or System Preferences), click the SwitchResX icon, and look under the Registration License Recovery:
Entering Your SwitchResX Serial Number
: Ensure you do not have multiple versions of SwitchResX installed in different PreferencePanes Switchresx Serial Number
Hope this helps!
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