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10 Tech How-To

Mac Won’t Install Apps or Gets Stuck Updating? Fix It

Guide 10-33718 · Updated · Step by step

If your Mac won’t install apps or gets stuck updating, the cause is usually a stalled background process, a permissions issue, or a corrupted download cache. This guide walks you through the most effective fixes, from simple restarts to deeper system checks, so you can get your software moving again.

Why Macs Get Stuck Installing or Updating

macOS relies on several background services to handle installations and updates. When one of them hangs, the whole process can freeze. Common culprits include:

  • App Store cache corruption – leftover temporary files can confuse the installer.
  • Network interruptions – a dropped connection mid-download can leave a partial package.
  • Insufficient storage – macOS needs free space for temporary files and the final installation.
  • Gatekeeper or security settings – apps from unidentified developers are blocked by default.
  • Software Update daemon issues – the background process that handles updates can stall.

Understanding these causes helps you target the right fix instead of trying random solutions.

Start With the Basics: Restart and Check Storage

Before diving into advanced troubleshooting, try these quick checks:

  1. Restart your Mac – this clears most temporary glitches. Click the Apple menu and choose Restart.
  2. Check free storage – go to Apple Menu > About This Mac > Storage. If you have less than 10-15 GB free, free up space by deleting old files or moving them to an external drive.
  3. Check your internet connection – open a web page in Safari. If it loads slowly, reset your router or try a different network.

If the problem persists, move on to the targeted fixes below.

Fix App Store Stuck Downloads or Updates

If the App Store shows a spinning wheel or a download that never progresses, try these steps in order:

  1. Pause and resume the download – click the X next to the progress bar to cancel, then click the cloud icon to restart.
  2. Quit and reopen the App Store – press Cmd+Q while in the App Store, then relaunch it.
  3. Sign out and back into the App Store – go to App Store > Settings (or Preferences) > your Apple ID > Sign Out. Then sign back in and try again.
  4. Clear the App Store cache – open Terminal and run: open $TMPDIR../C/com.apple.appstore/ then delete the files in that folder. Be careful only to delete files inside the App Store cache folder.

For macOS system updates that are stuck, restart your Mac and try again. If it still hangs, boot into Safe Mode (hold Shift at startup) and run the update from there – Safe Mode disables non-essential extensions that might interfere.

When Third-Party Apps Won’t Install

If you’re trying to install an app downloaded from the web (not the App Store), macOS may block it with Gatekeeper. To allow it:

  1. Right-click (or Control-click) the app file and select Open from the menu.
  2. Click Open in the dialog that appears. This adds a one-time exception.
  3. If you still see “can’t be opened because it is from an unidentified developer,” go to System Settings > Privacy & Security and look for a message about the app. Click Open Anyway.

If the app is damaged or incomplete, re-download it from the official source. Corrupted downloads are a common cause of “app is damaged and can’t be opened” errors.

Reset the Software Update Process

For macOS updates that hang, you can reset the update daemon:

  1. Open Terminal (in Utilities folder).
  2. Run: sudo softwareupdate --clear-catalog (enter your admin password when prompted).
  3. Then run: sudo softwareupdate --reset-ignored to clear any ignored updates.
  4. Finally, run: sudo softwareupdate --list to refresh the update list.

If that doesn’t help, delete the downloaded update files. Open Finder, press Cmd+Shift+G, and go to /Library/Updates. Move any files there to the Trash (you may need admin rights), then try the update again.

Check Disk Permissions and Repair the Disk

Corrupted permissions or disk errors can block installations. Use Disk Utility to verify and repair:

  1. Open Disk Utility (in Applications/Utilities).
  2. Select your startup disk (usually “Macintosh HD”).
  3. Click First Aid and then Run. This checks for errors and repairs them.

If you’re on an Apple Silicon Mac, you may need to boot into Recovery mode (hold the power button) to run First Aid on the system volume. This is safe and doesn’t erase your data.

Frequently Asked Questions

Why does my Mac say “macOS could not be installed” during an update?

This usually means the installer can’t write to the system volume. Try restarting, ensuring you have enough free space, and running First Aid from Disk Utility. If it persists, download the full installer from the App Store and run it manually – it will upgrade in place without erasing your data.

Can I force quit the App Store if it’s stuck?

Yes. Press Cmd+Option+Esc to open the Force Quit dialog, select App Store, and click Force Quit. Then relaunch it. This won’t harm your system, but it may cancel the current download.

Why won’t my Mac let me install apps from anywhere except the App Store?

By default, macOS only allows apps from the App Store and identified developers. To allow apps from anywhere (not recommended), go to System Settings > Privacy & Security and scroll down. You’ll see an option to allow apps from “Anywhere” – but Apple hides this by default for security. It’s safer to use the right-click Open method for individual apps.

What should I do if an update downloads but won’t install?

Try restarting your Mac and attempting the update again. If it still fails, reset the Software Update daemon as described above. Also ensure your Mac is plugged into power – updates often won’t install on battery below a certain level.

Is it safe to delete the “Install macOS” app from my Applications folder?

Yes, but only after the update is fully installed. The installer app can be several gigabytes, so deleting it frees space. If you need it later, you can always re-download it from the App Store.

Why does my Mac get stuck on “Installing” for hours?

This can happen if the system is verifying the update or if the disk is slow. Give it at least an hour. If it’s still stuck after that, force restart (hold the power button) and try again. In rare cases, you may need to reinstall macOS via Recovery Mode.

Related

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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