Performing In-Place upgrade of SEP client from 11.0.x to 12.1.x

Hi,

I have installed SEPM 12.1.4 server. Currently I am manageing both client version 11.0.z and 12.1.x from SEPM 12. I am performing SEP client autoupgrade in groups (Scheduled time).

My question is, does in-place upgrade of SEP client leave some orphaned data of old SEP client version (11.0.x)??

So far in-place upgrade is working fine without any problem, but I want to know if this is the recommended way to perform upgrade. Other and log way will be to uninstall SEM client from server - > reboot -> install SEP client 12 on it.

Thanks,