Error when trying to install Productivity Power Tools for Visual Studio 2010
See the question and my original answer on StackOverflowA .VSIX file is in fact a .ZIP file undercovers. Try to rename it and see what you have inside. Maybe it's just a corrupted download issue? I have tried this link http://visualstudiogallery.msdn.microsoft.com/d0d33361-18e2-46c0-8ff2-4adea1e34fef/ myself and it seems to work fine.