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During the early days of Fusion I had a similar experience. I was in a training class where the environment was provided on external hard drives...
It's only $50 if you've only got one Mac to upgrade. I've recently downgraded to two Macs, but I was having to purchase three upgrades for a time....
I'm a year late here, but this has been driving me nuts for years. I've finally just changed the "Device Connect" sound to "none" so I won't hear...