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Can I run PitStop Pro 9 with my PitStop Pro 10 key?
In order to run PitStop Pro 9 with a PitStop Pro 10 key, the easiest way to activate the license, is using the Local License Manager. It allows to manage all 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 10
activate the 10 product key (this will allow PitStop Pro 9 to run as well)
uninstall version 10 (do not deactivate the PitStop Pro 10 key)