Reg Resharper licensing for version 8.2 after upgrading to ReSharper Ultimate 2017.1.3

Hi Team

I have currently license of JetBrains ReSharper Ultimate 2017.1.3 version but to Run SILVERLIGHT Unit test cases , i also need to install Resharper 8.x version.

My issue is that Resharper 8.x version is not accepting the new license key (JetBrains ReSharper Ultimate 2017.1.3)

Can you please help me to run both version ?

PS : I don't have key for Resharper 8.x version but i expect lower version to work.