I downloaded EFPowerTools.vsix
from the official website. I made changes as shown in tutorial which shows how to install Power Tools in Visual Studio 2015. My Visual Studio version is 2015 Community.
This is my error:
Log:
Which step am I making mistake?
Here you have tutorial from Julie Lerman that worked for me, you can download updated VSIX right away, if you don't want to do the tasks.
http://thedatafarm.com/data-access/installing-ef-power-tools-into-vs2015/