This is what you need to do.
1. Use Orca editor, in accordance with KB255905 , to modify the .msi file and point the target path to %systemroot%\program files.
2. Copy EVClientXXm.msi and save it with a different filename.
3 Load ORCA and open the package.
4. Select the Property pane in the left column. You will see a TargetDir option in the right window. Double-click C:\Program Files\ and change to %SystemRoot%\Program Files\.
5. Place the .msi file in the same location as the original Cmc.msi file.
6. Run Add/Remove Programs and reference your modified .msi file. If this fails, repeat Steps 1-4 and change the drive letter from C:\ to the server drive letter.
PS. Make sure to NOT do a save as. Copy the msi and edit it, then save. The save as messes up the msi.
The hardcoded C: path is for backwards compatibility purposes.
Hope this helps.
Cheers