I am fixed it using the code public func ensureModel(transcriber: SpeechTranscriber, locale: Locale) async throws { guard await supported(locale: locale) else { throw TranscriptionError.internalFailure("localeNotSupported") } try await downloadIfNeeded(for: transcriber) // if await installed(locale: locale) { // return // } else { // try await downloadIfNeeded(for: transcriber) // } } func downloadIfNeeded(for module: SpeechTranscriber) async throws { if let downloader = try await AssetInventory.assetInstallationRequest(supporting: [module]) { Log.transcription.info("SpeechTranscriber download \(downloader.progress)") // self.downloadProgress = downloader.progress try await downloader.downloadAndInstall() } }