We have an old mobile application similar as the DWG FastView in Google Play store. It is called DWG FastView Pro.
Actually it is the out-dated and discarded long time ago. It is pay to download. And later, DWG FastView replaced the DWG FastView Pro.
Inside DWG FastView, there is premium or professional feature. You can buy to subscribe it.
If you bought DWG FastView pro, the deserted application, you can start it and move to the new application by the instructions. You can also apply your refund from Play store on your own and buy the new one.
Rember the Logo or icon of the new and old application:
Thanks very much for your understanding.