Models edits are not backward Compatible, beside a minor patch or two, but don't count for them to be backward compatible by a major patch or expansion
Texture's is more backward compatible
High Quality (512x512) is backward compatible to 3.0
Normal Quality (256x256) is backward compatible to 1.10 and i think it's only mine which still is that, however that is going to change soon
(I might add a pre 3.0 version)
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