Upgrade to 3.5 from V2

About to hit the pay button to upgrade to 3.5 but before I do two issues
A) can’t open my Licence key number - will that be needed anyway for the new licence?
B) Audirvana Plus not working on my MacBook Pro Late 2012 Retina. The symbol / icon app is there but fails to open . Music appears stored in the main Mac menu under Auto Audirvana and plays . But there is no integration as before with ITunes and no control dashboard ?
Do I need to uninstall the A + logo / app
Thanks

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