[Unity 2017.3 + Vuforia 7] - Could not find "VuforiaPluginLoader.mm"

Hello!

I am in some desperate need for help... I am on Windows 10 (64 bit) and, basically, whenever I try to build my project for iOS, it fails saying it was unable to find the file "VuforiaPluginLoader.mm".

This only happens when I enable VR using the Vuforia SDK for iOS - AR only works just fine (and so does VR on Android).

I tried reimporting Vuforia and even upgraded Unity to the latest patch (2017.3.0p4), but the issue persists. Building one of the example projects for Vuforia yielded the same result.

Here's the full stacktrace

 IOException: Failed to Copy File / Directory from 'C:/Program Files/Unity/Editor/Unity.exe\..\PlaybackEngines\VuforiaSupport\iOS/VuforiaPluginLoader.mm' to 'D:/Unity Projects/Builds/iOS_VR\Classes/VuforiaPluginLoader.mm'.
 UnityEditor.FileUtil.CopyFileOrDirectory (System.String source, System.String dest) (at C:/buildslave/unity/build/artifacts/generated/common/editor/FileUtilBindings.gen.cs:36)
 UnityEditorInternal.VR.iOS.PostProcessVR.ModifyXcodeProjectVuforia (System.String pluginFolder, System.String buildFolder) (at C:/buildslave/unity/build/Extensions/UnityVR/Editor/BuildPostProcessVR.cs:375)
 UnityEditorInternal.VR.iOS.PostProcessVR.PostProcessBuild_iOS (BuildTarget target, System.String path) (at C:/buildslave/unity/build/Extensions/UnityVR/Editor/BuildPostProcessVR.cs:196)
 System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
 Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
 System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
 System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
 UnityEditor.Build.BuildPipelineInterfaces+AttributeCallbackWrapper.OnPostprocessBuild (BuildTarget target, System.String path) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:86)
 UnityEditor.Build.BuildPipelineInterfaces.OnBuildPostProcess (BuildTarget platform, System.String path, Boolean strict) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:324)
 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

The file in question exists in my PC, but it seems Unity is somehow trying to find it inside the executable? Is there any way around this? Can I manually add the needed files and link them or something?