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PTVS installs into pre-Update 2 SKU if Pro+ is installed
In the description...
Even though we don't run /setup on the pre-update 2 SKU, it will still notice the new pkgdef, try and load our package, and report an error. This error is easily suppressed by the user, though our menus will appear and be useless until they update.
Applying update 2 makes PTVS work without having to reinstall.