Now it would be really nice to create an addon saying upgrade to example Crypto OS, so people can just click that button and upgrade, the problem is that it's a different product and also a different file, so the addon doesn't work in this case.

If Sellix would just add the one existing file manager like the one in product, so we can select what product the customer gets when he upgrades.

Or if it's a different variant I also can't upgrade to a different product, just the same one with some extra features.

This is a pretty basic feature that I believe would benefit everyone!