How can I have a fully automated build process that can fetch and install any version of Unity into our build environment? – Unity Support Help Center

Symptoms

I need to be able to install Unity to a specific path on MacOSX and Windows. Also, I want to automate the installation by downloading separate components and installing myself.

Cause
 
You may not want to use the download assistant/Unity Hub to install.
 
Resolution
 
If you want to automate the installation of Unity, you could use the the command line (or a script) without the Download Assistant.
 
On Windows:
You can use on Windows this command to install Unity silently to a specific folder:
UnitySetup64.exe /S /D=C:\Your Directory\Unity
In this case, the command installs Unity silently to the folder C:\Your Directory\Unity, which will be the root of the Unity installation. The Unity Editor executable will, in this case, be installed in C:\Your Directory\Unity\Editor\Unity.exe. “/D” argument must be last and without quotes, even if the path contains spaces.
On OSX:
sudo installer [-dumplog] -package Unity.pkg -target /Separate Components:
In addition, if you want to install the components separately, you can use the same commands with all the component installers. The urls for them are:
 
For Windows:
http://download.unity3d.com/download_unity/{Changeset}/Windows64EditorInstaller/UnitySetup64.exe
http://download.unity3d.com/download_unity/{Changeset}/WindowsDocumentationInstaller/UnityDocumentationSetup.exe
http://download.unity3d.com/download_unity/{Changeset}/WindowsDevelopmentWebPlayerInstaller/UnityWebPlayerDevelopment.exe
http://download.unity3d.com/download_unity/{Changeset}/WindowsStandardAssetsInstaller/UnityStandardAssetsSetup.exe
http://download.unity3d.com/download_unity/{Changeset}/WindowsExampleProjectInstaller/UnityExampleProjectSetup.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Windows-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Android-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-iOS-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-AppleTV-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Linux-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Mac-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Metro-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-UWP-IL2CPP-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Samsung-TV-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-Tizen-Support-for-Editor-{version}.exe
http://download.unity3d.com/download_unity/{Changeset}/TargetSupportInstaller/UnitySetup-WebGL-Support-for-Editor-{version}.exe
 
For OSX:
http://download.unity3d.com/download_unity/{Changeset}/MacEditorInstaller/Unity.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacDocumentationInstaller/Documentation.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacWebPlayerInstaller/WebPlayer.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacStandardAssetsInstaller/StandardAssets.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacExampleProjectInstaller/Examples.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Mac-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Android-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-iOS-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-AppleTV-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Linux-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Samsung-TV-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Tizen-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-WebGL-Support-for-Editor-{version}.pkg
http://download.unity3d.com/download_unity/{Changeset}/MacEditorTargetInstaller/UnitySetup-Windows-Support-for-Editor-{version}.pkg
 
For Linux:
http://download.unity3d.com/download_unity/{Changeset}/LinuxEditorInstaller/Unity.tar.xz
http://download.unity3d.com/download_unity/{Changeset}/LinuxEditorTargetInstaller/UnitySetup-Linux-IL2CPP-Support-for-Editor-{version}.tar.xz
http://download.unity3d.com/download_unity/{Changeset}/LinuxEditorTargetInstaller/UnitySetup-WebGL-Support-for-Editor-{version}.tar.xz
http://download.unity3d.com/download_unity/{Changeset}/LinuxEditorTargetInstaller/UnitySetup-iOS-Support-for-Editor-{version}.tar.xz

 
It is important to note that the order is important (you should install the Editor first and then the components).
 
More Information

Installing Unity
 
 
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