Can’t even launch the app now in Mavericks

Since Mavericks I decided to load a song I did last year to master it. Won’t even load. Get Audio Units error, yet these plugins work fine in Cubase.

I can’t even get around it to open the program, there really should be an option to ignore loading plugins that don’t work with it anymore.
Why with an update do your UP TO DATE plugins you pay for become unuseable is unconscionable!

I should have stuck with my older version I would have actually been able to use it!

Please fix thism the Older version Garage Band was great. Bring the greatness back.

Shiverca about GarageBand, v10.0.2