This is technically not a VSTO question. It belongs in an end-user newsgroup; you'll find a set of links to newsgroups in the forum's
Please Read First message.
FWIW Office does
not officially support parallel installations of Office applications. It can (usually) be done, but problems and conflicts can arise. As far as VSTO (the topic of this forum) goes, it is truly not supported and it is not guaranteed that VSTO will function properly. We recommend you use virtual machine software in order to provide a development and testing environment for various OS + Software version combinations.
Therefore, you will get no opinion on your request in the VSTO forum and I'm therefore moving this message to the off-topic forum.
Cindy Meister, VSTO/Word MVP