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Can I run PitStop Pro v9 with my PitStop Pro v10 key?
In order to run PitStop Pro v9 with a PitStop Pro v10 key, the easiest way to activate the license is using the Local License Manager. It allows you to manage all of your Product Keys quickly and easily from within one application. The Local License Manager can be found here: Local License Manager
The second (more elaborate way) would be to follow these steps:
Install PitStop Pro v10
Activate the v10 product key (this will allow PitStop Pro v9 to run as well)
Uninstall version 10 (do not deactivate the PitStop Pro v10 key)