[v3.0.6.1265] System.UnauthorizedAccessException: Access to the path 'ICSharpCode.SharpZipLib.dll' is denied.
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound, WIN32_FIND_DATA& data)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at NzbDrone.Common.Disk.DiskProviderBase.DeleteFolder(String path, Boolean recursive) in M:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Common\Disk\DiskProviderBase.cs:line 290
at NzbDrone.Common.Disk.DiskTransferService.MirrorFolder(String sourcePath, String targetPath) in M:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Common\Disk\DiskTransferService.cs:line 157
at NzbDrone.Update.UpdateEngine.InstallUpdateService.Start(String installationFolder, Int32 processId) in M:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Update\UpdateEngine\InstallUpdateService.cs:line 120
Something is locking this file, the first thing that comes to mind would be anti-virus.