Just a small request that I think could be useful, in case it's not written down anywhere :)

I have an asset pack for which I recently released a Pro version. Ideally, users who had already bought the pack would be able to simply upgrade to pro for a discount. 

This isn't possible. As a workaround, I created a separate project for the Pro version, then created a sale that would only work for users had already purchased the original pack. 

I put a banner at the top of the original pack to help users navigate to the sale, but it's a bit clunky. I'll be doing something similar for other packs, so I'd really appreciate simpler UX :)