[2020] Detail information regarding upgrade packs for all generations from kickstarter to release

As noted by @Jerle (thanks for the ping, btw!), you can only upgrade to packs in the same series as the one you are upgrading from, and the packs have to still be available in our store. As a result, it wouldn’t be possible to upgrade from an Ancient Champion pack.

Our support article regarding upgrades can be found here. If you have any questions regarding our policy, feel free to either post here or reach out to us through our support site.