Unlike the current Waves Creative Access subscription model, Waves V10 was sold via perpetual licenses. If you own a V10 license on a USB flash drive or in your Waves account, you must install V10. A is the only way to reactivate after a system restore.
Waves V10 was a major milestone release. It introduced several backend improvements that enhanced the user experience on Mac OS X: waves 10 complete bundle for mac os x link download