Once fix SO09605 is downloaded, the way to apply the fix is to unzip it and then execute "applypatch.bat" on the target server, but if C: drive is not being used, the fix fails.
Client Automation 14 SP2 and later
This is caused because the C: drive is hardcoded in the BAT file as shown here:
The way to solve this is to modify 'applypatch.bat' manually, changing the drive letter to the one currently used by your Client Automation installation.