This week's sponsor

Daylite the productivity app built for individuals and teams, exclusively for Mac and iOS


How To Fix Mac App Store “Error 100”

The Mac App Store went live less than an hour ago and as I installed the OS X 10.6.6 update required to use the new Store, I rebooted my computer and logged in the Mac App Store using my Apple ID. As I tried to download a free app, the Mac App Store returned Error 100, saying:

We could not complete your App Store request. An unknown error occurred.

We're also getting several reports from users still unable to download apps from the Mac App Store because of this error. The cause seems to be lying in the fact that in the first minutes the Mac App Store went live and Apple let users log in with Apple IDs, they didn't include the updated Terms and Conditions to accept before start using the Store. Thus many users, including me, logged in without accepting the Terms and were unable to download apps because they were stuck in some sort of "limbo".

Here's how you can fix it:

- Sign out from the Mac App Store. You can do it by accessing the "Quick Links" section in the Mac App Store homepage and clicking on "Account". Sign out.

- Quit the Mac App Store app.

- Log out from your computer; log in again.

- Open the Mac App Store, sign in with your Apple ID, try to download a free app and accept the Terms and Conditions when asked. After that, the download should start.

- If a logout doesn't fix the issue, restart your Mac instead. We're hearing that a reboot fixed the problem for many users.

If you're still experiencing the issue, please let us know in the comments.

Want More from MacStories?

Club MacStories offers exclusive access to extra MacStories content, delivered every week.

Club MacStories will help you discover the best apps for your devices and get the most out of your iPhone, iPad, and Mac. Plus, it's made in Italy.

Starting at $5/month, with an annual option available. Join the Club.

A Club MacStories membership includes:

  • MacStories Weekly newsletter, delivered every week on Friday with app collections, tips, iOS workflows, and more;
  • Monthly Log newsletter, delivered once every month with behind-the-scenes stories, app notes, personal journals, and more;
  • Access to occasional giveaways, discounts, and free downloads.