Downloading Google Play for Venue 8 Pro

windows 8 pro is a OS and android Is another OS the playstore is a part of the Android OS the only way to get the playstore or android apps to work for yourt ab woud be to modify the OS aka Dual boot windows and android or completely wipe windows 8 and install android OS . Either of these tasks require alot of knowledge in both windows 8 pro and Android OS to port. since these are both relatively new tablet dont hink its happening anytime soon. But theres bound to be someone with the skills to do this sooner or later though.

Wished would have known that before I purchased...

As noted, the Venue Pro is a Windows tablet, running Windows 8.1.  Dell's Venue (no 'Pro') is an Android tablet.  Installing Google Play and using Android apps on the Venue Pro isn't like installing Google Play on an Amazon Fire to run Android apps where the base OS is the same/similar; it would be like installing Google Play and running Android apps on an iPad.  Like Google/Android and Apple have their own app stores for running apps on their devices, Windows has its own app store for apps that run on its devices.  The app ecosystem is not as mature as Google/Apple (it is much younger), and it is completely up to the service/product developer to create for the Windows platform(s).

The only option you have is using on your Venue 8 Pro an Android emulator, such as BlueStacks and then downloading Google Play Store with the APK file. Then, you will be able to have Google Play on your tablet.