I did a fresh install of Windows 10 x64 march update.
I installed some application/tools : SQL Server standard 2016, VS2015, VS2017.
I downloaded from a support thread the version : DevExpress.CodeRush.Roslyn-188.8.131.5209
VS2015 and VS2017 closed, I installed the VSIX, CodeRush is installed in both versions at the same time.
When I start VS2017 (same for VS2015) and I try to register VS freeze ("Visual studio is busy")
Then I removed CR from both VS.
Then I added CR via "Extensions and updates" to VS2017 and then it was possible to activate CR.
Could you check if you can reproduce this behavior ?