Changed
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Version only. The contents are identical to 1.0.0.
The modpack this replaces always declared itself version 1.0.0, and the launcher decides whether an update exists by comparing that number. Publishing the runtime as 1.0.0 meant every existing install compared equal and would never have been offered the migration at all.
2.0.0 also states the truth: the bundle no longer contains mods, which is a breaking change for anything that expected them inside it.