Thank you for the kind words :) Still improving, expect a new (big) update in November.
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I'm absolutely not planning to do a subscription fee because I'm personally against such a set-up, you can bet on that because Itch.io is the only platform I sell on and they don't even offer the option hah.
This is unfortunately not possible due to the reason you specified. Currently the program works by keeping the block models in the internal data and saving just block id's, position, rotation etc. to the save files. I'd recommend keeping an older version around to open older files. This is expected to be an issue only going from the 1.X release to the 2.X release.
This request has been fulfilled in Asset Forge 2.1.2 which has been released or will release soon.
It'll feature a list of recently used blocks (reset when program closes), and a list of favorites - you can right click to favorite a block. This is saved.
I should indeed add that to the clarification, however it is true that the textures have the same license as the blocks. So any creation made using elements that come with Asset Forge are yours to do with whatever you please.
Yes, please refer to the included readme.txt file which states:
All included blocks are 'Creative Commons Zero' licensed (see below).
Creations made in Asset Forge can be used in any sort of production such as personal, education or commercial.
Block/model license (Creative Commons Zero, CC0)
Some blocks are designed to fit together but others aren't and you'll have to use the scaling option in Asset Forge to make them fit. When duplicating blocks they should remain the same size, are you sure you didn't accidentally scale or pressed a hotkey while moving the engines?
Hey, well specifically for terrain your mesh will have to adhere to a few rules that Unity set-up. One of those rules is (according to the error message you posted) that your prefab contains a mesh renderer. If it doesn't, that means your mesh is probably in a child of the prefab instead of the prefab itself. Hope that helps!