If you're unable to find your serial number or need to verify its validity, you can perform a Mac lookup using the following methods:
for Mac, specifically about managing your serial number or license now that the product has been discontinued, here is a feature summary. Status of FontExplorer X Pro Monotype officially discontinued the FontExplorer X family of products as of June 30, 2023 New licenses have not been available since June 30, 2022. Fontexplorer X Pro Serial Number Mac Lookupinstmankl