I bought the game last night and after much trouble finally was able to download the game.

However, when I go to install the game I get this.

Windows installer

"This istallation package could not be opened. Verify that the package exsit and that you have access to it, or contact the application vendor to verify that this is a valid Windows installer package. "

Hello Muppet Gonzo,

 

Welcome to the forums and thank you for joining us! Where did you purchase the game from? Was it through, Steam, GOG, App Store? If it was from Steam, have you tried verifying your game cache? In your Steam library, right click Pillars of Eternity > Properties > Local Files > Verify Integrity of Game Cache. If you are using GOG Galaxy, try verify/repair. 

 

Let me know how it goes.

 

Thanks!