I tried to purchase GSX Pro for MSFS2020 but every time I try it would get stuck at the following screen: Can you please help me sort this out please?
We can't really help you, because that page is not even on our site, you are already on Digital River site, it's not our site code that is running there. From the looks of it, it seems you are getting some kind of error or warning, which is not visible for some reason.
I'll first try with a different browser. If that doesn't work, try with a completely different device, like a Phone or Tablet. If still doesn't work, I suggest contacting Digital Rivers support here:
https://www.mycommerce.com/shopper-support/