Uninstall Microsoft Edge WebView2 Runtime and reboot the server.
Download the Evergreen Standalone Installer x64 (MicrosoftEdgeWebView2RuntimeInstallerX64.exe) from https://developer.microsoft.com/en-us/microsoft-edge/webview2
Right-Click MicrosoftEdgeWebView2RuntimeInstallerX64.exe and run as Administrator.
Once installation is complete, reboot your GPOAdmin Server.
You should now be able to install GPOADmin.