Tried to launch the Open Dev Lucy campaign, got the following giant dialogue box:

[Storage.Exception] OnProtectedStorageContainerReadOpening failed: Mount C:/Users/Owner/AppData/Local/Temp/AMPLITUDE Studios/Humankind\Mount\18446744071573303614 not found.

  at Amplitude.Framework.Storage.LocalDrive.LocalDriveStorageContainer.OnProtectedStorageContainerReadOpening () [0x00000] in <00000000000000000000000000000000>:0 

  at Amplitude.Framework.Storage.StorageContainer.OpenStorageContainerRead () [0x00000] in <00000000000000000000000000000000>:0 

  at Amplitude.Framework.Storage.StorageContainerInfo+<>c__DisplayClass3_0.<OpenStorageContainerRead>b__0 () [0x00000] in <00000000000000000000000000000000>:0 

  at System.Func`1[TResult].Invoke () [0x00000] in <00000000000000000000000000000000>:0 

  at Amplitude.Framework.Storage.StorageThread.Update () [0x00000] in <00000000000000000000000000000000>:0 

  at System.Action.Invoke () [0x00000] in <00000000000000000000000000000000>:0 

  at Amplitude.Threading.Thread.ThreadStart (System.Object parameter) [0x00000] in <00000000000000000000000000000000>:0 

  at System.Xml.Schema.XdrBuilder+XdrEndChildFunction.Invoke (System.Xml.Schema.XdrBuilder builder) [0x00000] in <00000000000000000000000000000000>:0 

  at System.Xml.Schema.XdrBuilder+XdrEndChildFunction.Invoke (System.Xml.Schema.XdrBuilder builder) [0x00000] in <00000000000000000000000000000000>:0 

  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <00000000000000000000000000000000>:0 

  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) [0x00000] in <00000000000000000000000000000000>:0 

  at System.Xml.Schema.XdrBuilder+XdrEndChildFunction.Invoke (System.Xml.Schema.XdrBuilder builder) [0x00000] in <00000000000000000000000000000000>:0 

What the heck does that mean?

Ok, I verified integrity of game files and relaunched and it loaded ok this time.