I downloaded the extension from here and when I doubleclicked on the vsix package nothnig happened.
I checked out the extension.manifest file in the package, and these are the supported version there:
<Installation>
<InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="11.0" />
<InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="12.0" />
<InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="14.0" />
</Installation>
When VS Community got out, you had to do this to get EF Power Tools to work, but SideWaffle uses the 2.0 manifest version and that doesn't work.
I tries adding Microsoft.VisualStudio.Community but that didn't work either. Any ideas on how to make this work?
No idea why it didn't install when I ran it, but I did find a workaround:
Open Developer Command Prompt for VS2015 and run VSIXInstaller {path to vsix file}
That did the trick.