A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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I need 5.3.1f1 32bit but http://netstorage.unity3d.com/unity/910d71450a97/Windows32EditorInstaller/UnitySetup32-5.3.1f1.exe is 404.
In my case, I solved "Unfortunately, <project_name> has stopped" by disabling "Virtual Reality Supported" for Android build. Then, game started as...