Access to betas after buying products

[MickRose]

As I understand it some people are worried about possible file format changes between the beta and the final release, meaning when the betas expire they might not be able to open old files using the final product release. Here's a suggestion. After buying a product, users should have access to non-expiring betas of that product. That way users wouldn't be worried about file format changes. It might be a bit fiddly to implement but it would be good PR.