I've encountered two issues when attempting to upgrade to v2.
The upgrade page seems to only accept license keys from unlimited personal v1. I have an unlimited personal license and an unlimited business license. The latter was rejected. If I'd only purchased a business license and couldn't get a discount to upgrade to v2 I'd be fairly ticked off.
Since I have both business and personal I could use the personal license to generate a discount code. Unfortunately ShareIT (the purchase site) rejects that as invalid.
Perhaps I have an unreasonable consumer-centric viewpoint, but when customers have to plead for help to complete purchases, they tend to go away.