NP. No offence was meant. I was truly curious to understand why you'd want an Android like app for Windows? Evolved over decades to v5.2, HTML is mature and well standardised. A browser such as Chrome actually does a better job. Even in Android, on my 9.7" screen tablet I prefer using the desktop version in Chrome for lessons over the GT app, which I have coincidentally installed.

As it is, when you go to use the GT lessons including videos on Win10, the way that part of GT has been constructed to prevent ripping of their material is already almost an ersatz app within the browser in its presentation.

When a publisher requires installation a proprietary app as a GUI to view their material in Win, its purpose is invariably control so they can impose restrictions and secure their material from redistribution e.g. Pocketmags. Cheers.