How can I install a VSIX package automatically, with WIX?

This can be done through a custom action which launches VSIXInstaller. Exe with the appropriate command line. There is a discussion about this here: http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/VSIX-after-installation-td4975318.html.

WiX v3.6 supports the VsixPackage element to directly manage VSIX packages.

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