If you have already purchased a license and lost your key, do not look for "free" keys online, as these are often associated with security risks. Instead, use these official methods to recover your key: SAP Crystal Reports | Business Intelligence Reporting Tools
For developers, SAP offers free versions of Crystal Reports for Visual Studio and Crystal Reports for Eclipse . These allow you to embed reporting functionality into your applications at no cost. How to Retrieve a Lost Product Key sap crystal reports 2016 product key free