When attempting to deactivate after activating in both 32-bit and 64-bit CS 4 an error -20 occurs.
With Windows Vista and Windows 7 there is a feature called User Account Control (UAC). With UAC this prevents both versions of our plug-in from writing to the registry. You have to deactivate under the version of Photoshop you first activated under.
If you cannot remember which version of Photoshop CS 4 or CS5 (32-bit vs. 64-bit) you activated under you will need to use the included License Manager to deactivate with. To locate this go to C:\Program Files\onOne Software\<onOne Plug-In>. Double click on the License Manager.exe and click on the button for Internet Deactivate. Type in your license number and then click on the Deactivate button.
To easily activate/deactivate your onOne product in both versions of Photoshop you can temporarily turn off UAC and then activate under both versions of Photoshop.
If you cannot locate your license number please contact customer service and if you’re registered they will be able to retrieve your license number.