Same here, here's the error:
20:34:19|INFO|SeventhHeaven.ViewModels.ImportModViewModel|Mod import progress: Parsing information from mod.xml | 50.00%
20:34:19|INFO|SeventhHeaven.ViewModels.ImportModViewModel|Mod import progress: Copying .iro file to library | 75.00%
20:34:19|ERROR|SeventhHeaven.ViewModels.ImportModViewModel|System.UnauthorizedAccessException: Access to the path 'G:\G-Steam\steamapps\common\Final Fantasy VII\mods\7th Heaven\debe4027-3b07-4fab-a45b-d7acb444973a_FF7 NT IRO.iro' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)
at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)
at _7thHeaven.Code.ModImporter.Import(String source, String name, Boolean iroMode, Boolean noCopy)
at SeventhHeaven.ViewModels.ImportModViewModel.TryImportFromIroArchive()