We had the same scenario. Had to install 10.2.1 and 10.2.2 versions in the same server, on different directories.
The error CAM-AAA-0064 The function 'CAM_UnprotectData' failed. with the detail 'CAM-CRP-0157 Unable to complete a call to the cryptograph...
The error CAM-AAA-0064 The function 'CAM_UnprotectData' failed. with the detail 'CAM-CRP-0157 Unable to complete a call to the cryptograph...