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Hello, yesterday I downloaded a project from a repository that needed a 2020.3.7f1 version, upon opening the project, the following error raised:
Shader compiler initialization error: Failed to read D30 Compile DLL file something is preventing access to D3DCompiler 47. dl. Check your Editor installation integrity, file access rights and antivirus configuration.

  • I created a new project and the same happened when opening it. Versions 2019.3.16f1 and 2021.17.f1 also have the same issue.
  • I have tried reinstalling the version and updating the Unity hub. I have DirectX installed, I also checked the System32 folder and the dll is there, plus it has reading permissions.
  • Common causes - incomplete download so suggested to re-install. So I did it 3-4 times
  •  Due to Anti Virus - permission issue so as per suggestions open the project in a public folder.

Is there any known fix that isn't downgrading the version? Any help or possible fix would be appreciated.

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1 Answer

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  1. The antivirus software I used (360 Total Security) seemed to be locking the DLL from the Unity version AT INSTALLATION, so even if you deactivate the antivirus, you can't open projects, so you need to deactivate/uninstall it, then install the version you need and that solves the problem.
  2. Turn Off the Windows Defender then try to Open Unity Hub with “Run As Administrator”.
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