Hi Macadamia
The Windows and Web (Mac/mobile) versions share the same functionality. The primary goal of the Windows PC is to allow offline functionality similar to the cloud functions available in the web app, it does not contain more functionality as it once did.
Regarding the running of parallels, the fact that it's hanging as it starts tells me that the USB connection speed is not fast enough, as the first step of the installer is to connect to your GS-911 via USB. These settings can be altered to improve speed depending on the VM software you are using.
Kind regards
Ruan