cant install EFPowerTools.vsix

hi

i have installed visual studio 2012 proffessional

and i have download EFPowerTools.vsix from this link:

https://visualstudiogallery.msdn.microsoft.com/72a60b14-1581-4b9b-89f2-846072eff19d

but i couldnt install it! i have windows 7 home premium

what should i do?

i have read this thread:

http://forums.asp.net/t/1587839.aspx?Not+able+to+Install+VSIX+Extensions+in+the+Visual+web+Developer+2010

but it didnt help me