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Question by techshaman · Sep 12, 2012 at 08:10 PM · unity 4version

Lowering Unity Project Version

Hey guys,

I was wondering if there is a way to 'lower' the unity version associated with my project? I recently tried unity 4 beta, which upgraded my project, but I cannot now open it up in the older unity 3.5... is there a way to do this? Thanks!

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avatar image PProductions · Sep 13, 2012 at 05:52 PM 2
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I know this is not an answer, but it is always good practice to back up projects when upgrading, especially when you change to beta and pre-release software.

avatar image DaveA · Sep 13, 2012 at 05:54 PM 1
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Yes, ALWAYS make a copy when you install a new version of Unity, because you never know.

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Answer by coastwise · Jan 17, 2013 at 02:08 PM

I have successfully downgraded a project, but I had enabled "meta files" before starting. I've written up some instructions for enabling them in your situation, but that part of the solution is yet untested. YMMV

If you have not been using "meta files":

  1. Open the upgraded project in Unity 4

  2. Edit > Project Settings > Editor

  3. Switch Version Control Mode to Meta Files

  4. Quit Unity 4

Open your project in Finder / Explorer and check to make sure that inside your Assets folder, every file has an associated .meta file. These can be used to rebuild your project library, which we are about to nuke. If not, go back and redo the previous steps. Do not continue unless absolutely certain your meta files are working, or you have a backup. I take no responsibility for botched projects. Disclaimer, etc.

  1. In Explorer / Finder, go to your project root

  2. Delete the Library and Temp folders

  3. Delete all the Assembly-* files, and any .sln or .userprefs files (just to be sure. this step is probably optional)

  4. Open the project in Unity 3

  5. Wait while Unity rebuilds your Library

  6. Rejoice!

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avatar image Nidre · Nov 25, 2013 at 11:54 AM 0
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I am getting the following after perfor$$anonymous$$g the steps you have listed, any idea how to fix it ?

typeTree.m_Children.front ().m_Type != SerializeTraits::GetTypeString (NULL)

avatar image shuaibimran · Feb 28, 2016 at 01:53 PM 0
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It works like charm in my case.(5.3.3 to 5.2.0)

avatar image Nsingh13 · Nov 12, 2016 at 08:08 AM 0
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You sir, are a life saver! Thank you so much!! (Unity 5.4.2 to Unity 5.3.3)

avatar image HarryMcCurly · Jul 19, 2017 at 10:48 AM 0
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Worked for me (5.6.2f1 to 5.6.0f3)

avatar image wesdraven · May 23, 2018 at 12:17 PM 0
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Works from 2018.1 to 5.5.1f1! It saved me days of reworks, thanks @coastwise !

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Answer by Screenhog · Sep 13, 2012 at 09:01 PM

Unity does not provide support for reverting back to a lower version. They usually give a warning before upgrading a project that it won't be able to be reverted back to an earlier version.

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Answer by naveedatta071 · Apr 19, 2018 at 10:33 AM

You are genius...@coastwise Thanks .....

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