You can verify the module installation using the following ways:
Go to Modules> Endpoint Module Administration > Installed Modules and check if the Extended Forensics module is displayed in the list.
Verify the status of the module using the Endpoint Server API.
Check the agent log for the following lines.

Where VERSION is the installed version of the Extended Forensics module.
Check whether the following directory exists on the endpoint: C:\ProgramData\Trellix\xagt\exts\plugin\PyDEX\