That's odd, what is your version of visual studio ?
The manifest for the vsix enables it for the following:
The manifest for the vsix enables it for the following:
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.Pro" />
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.Premium" />
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.Ultimate" />
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.VSWinExpress" />
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.VPDExpress" />
<InstallationTarget Version="[11.0,]" Id="Microsoft.VisualStudio.VWDExpress" />