Error 13; error 100

Question

To whom it may concern,
I can't update the software I have purchased nor install them onto my iMac, even though the system shows I am logged in with App Store. It keeps showing error 13, or error 100.
I can do it on my AIR, iPad, iPhone 4G; however.
Please advise.
Best regards,
Andrew

Answer 1

This is how I fixed it when I couldn't update a game on my iMac and was constantly getting error code 13 and 100, but as with you all worked well on my Macbook. You must be logged in as administrator. Create new user account. Log out, restart, and then log back in with new user account. Open App Store sign in and try update/purchase. Worked perfectly for me.  Log out of the new account and log back in to the original account or you won't have access to the home folder of the original account. I see, and had no need to reinstall the system OS. However the problem account still has the problem. It can be deleted and another account set up if you want, though this may not be practical since you will have to re-do all the settings in the new account. Just be sure to save the home folder from the original account before deleting or you will lose all downloads, documents, etc. for that account. You will be prompted to save the home folder when you attempt to delete the account. As for me...I kept both accounts because I didn't want to go through the hassle involved with deleting the problem account and setting it up again.
Peace,
Bennie