Just wanted to bring to everyone's attention this horrendous bug in Unity 2017.1.2p3 (and probably other versions as well). My build process was getting interrupted with the following error: UnauthorizedAccessException: Access to the path "C:\Program Files\Unity_2017_1_2p3\Editor\Data\UnityExtensions\Unity\VR\Android\OVRPlugin.aar" or "Temp\StagingArea\aar\OVRPlugin.aar" is denied. The solution was to rename the OVRPlugin.aar file to another extension like OVRPlugin.bak. I don't know why Unity would even be looking inside the Editor folder, since I have a plugin inside my project. I would assume it would use plugins inside the project first before ever looking in the Editor folder.