LGPO is required for full OSConfig functionality. It is part of the Microsoft Security Compliance Toolkit and can be downloaded from the following link
Security Compliance Toolkit and Baselines
Microsoft Download Center
From the link above, when selecting Download, you have to option to select individual components. Select the LGPO.zip
Extract the zip and place LGPO.exe and LGPO.pdf into the OSConfig\LocalPolicy\LGPO directory
Copy link