1. Before you install CPS V2.5 or later, uninstall any earlier versions of CPS. 

2. Mainline CPS: You cannot install CPS of different regions on the same computer.

3. Customized CPS: You can install different customized CPS on the same computer.

Remarks:
Version comparison rules is as follows:
1. Install a higher version over a lower version: The older version will be overwritten and upgraded to the later version.
2. Install the same version: A prompt will appear: "The same version of CPS software already exists. Are you sure you want to reinstall it?" 
    Click "Confirm" to proceed.
3. Install a lower version over a higher version: A prompt will appear: "A higher version of CPS software already exists. If you still want to install it, please uninstall first!".

(Note: If you want to install multiple versions of mainline CPS, it is recommended that you use MendInstall.exe to clear the registry information.)