is this possible?or is there sa safe way?
My recommendation to this question is always to backup your files and just see what happens when you open it with an older release. I have tried it with at least one project in the past and it worked out just fine but it’s always going to be the case that your mileage will vary as it’s not officially supported.
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Yeah, as Ryiah says, Unity recommends you have a backup before you upgrade for reason.
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Unity specifically doesn’t support rolling back to previous versions, but it doesn’t actively prevent you from doing so. How successful it is depends entirely on what changes to Unity were implemented between the two versions.
For example, if Unity has only added a few new features you’re not using and added some bug fixes, you’re likely to be successful in the rollback. As another example though, in 2018.3 they redesigned the prefab system, terrain system, and upgraded the physics engine. Rolling a 2018.3 project back to 2018.2 I’d expect lots of problems around any of those features, possibly having to recreate all your prefabs and terrains from scratch.
Look at the release notes for every version released between the two versions you are moving between, to get an idea of where your problems might be.
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