I just install the v16.1.6 of CRR the same way as the preview release.
Scenario :1. CRC installed but unloaded (load manually)
2. I updated CRR to 16.1.6
3. Restart VS2015
4. Open project and go to .cs file
5. I got a message "You have to version of CodeRush installed, You need to restart VS".
After restart, CRR is disabled and CRC unloaded (normal).
The question is just .... is it normal ? CRC is installed yes but not loaded.
I removed CRC and enabled CRR