My simple workaround for supporting users who could potentially use a newer version than I was, is to direct them to a website with a quicksupport link to download the client. I was in the same boat as you having to direct the client/customer through the caverns of teamviewer to the right version/OS. Instead got a cheap godaddy domain, cheap hosting and uploaded the quicksupport exe right on the main index page. The other option is to just email them the quicksupport download link for the same version as you. Uninstalling your paid 10 or 11 client and installing 12 everytime is crazy.
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