WP Smush Pro Activation

I have both the WP Smush & WP Smush Pro plug-in's installed. When I try to activate the Pro one it doesn't seem to want to do that. Do I need to deactivate the free one before the Pro will activate?

If I'm not fully clear or if you have any further questions, please let me know.

Thanks,
Jimmy Paul
Bettinardi Golf
jpaul@bettinardi.com