For volume licensed versions, the installer is often "pre-keyed." You can find the key by extracting the installer files and checking the \server\amd64\license.txt file. Upgrading from Trial to Full Version
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Customers who purchased through a Cloud Solutions Provider (CSP) or a Microsoft Partner should contact their partner directly to obtain their unique dual-usage license key. Where to Find an Already Installed Key dynamics crm 2016 product key