There are 2 methods to verify the version of the Password Capture Agent installed:
Navigate to the folder of Password Capture Agent installer ("Modules\ADS\dvd\AddOn\PasswordCaptureAgent") and select Windows Installer Package (msi) for Password Capture agent and click on the "Details" tab. The version is under the Comments Field.
On the Domain Controller where Password Capture Agent is installed, navigate to "C:\Program Files\Dell\One Identity Manager\Password Capture Agent\Service\D1IMPWCaptureAgent.dll" (for earlier versions) or "C:\Program Files\One Identity\One Identity Manager\Password Capture Agent\Service\PCA_Service.dll". Select the dll file, right click and select Details Tab. The version of the PCA is indicated under "Product version" field.