Fix Guide: Apple Intelligence "Downloading" Stuck on macOS Tahoe

Symptom: You've joined the Apple Intelligence waitlist and been accepted, but the progress bar for "Downloading Models" is stuck at 0% or 1% for hours.

Why this happens

The Apple Intelligence models are several gigabytes in size. The download service (mobileassetd) often hangs if there is a regional mismatch in your Language & Region settings or if there is insufficient "purgeable" disk space.

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Fix 1: Check Language & Region

1. Go to System Settings > General > Language & Region.
2. Ensure Primary Language is set to English (United States).
3. Go to Apple Intelligence & Siri and ensure the language there also matches.
4. Restart your Mac.

Fix 2: Force Restart the Download Daemon

1. Open Terminal.
2. Type sudo killall mobileassetd and press Enter.
3. This process manages the background download of the AI models. It will restart automatically and often resume the stuck download.

Recommended Tool: CleanMyMac

You need at least 15-20GB of free space for the AI models to install.

- Download CleanMyMac to clear out large/old files and system junk, ensuring the Apple Intelligence models have plenty of "breathing room" to download and expand.