I am trying to get the CR 2011 Trial license key for my application (3.5 Framework)

[JanarthananS]

I am trying to get the CR 2011 Trial license key for my application now. 

The application were built based on .Net 3.5 Framework and we already using crystal report of lower version.

[DonWilliams]

CR 2011 is end of life.

CR for Visual Studio only supports the latest 4.7 and 4.8 framework because of end of life by Microsoft.

Go here and find CR for VS and you'll get the latest SP 35 downloads:

https://www.sap.com/canada/products/technology-platform/crystal-reports.html

Or this one:

https://help.sap.com/docs/SUPPORT_CONTENT/crystalreports/3354091173.html