Apple OS update to El Capitan, issues

I was helping someone else to update their OS.

For some reason it wouldn't let them download it using their own Apple ID (in the Apple Store), kept giving a generic error. So I logged in with my Apple ID and it worked, downloaded & installed fine.

Now, whenever they want to get updates using their own Apple ID it says "Update Unavailable with this Apple ID - This update is not available for this Apple ID either because it was bought by a different user or the item was refunded or cancelled."

This is extremely frustrating. How can I allow it to work with their ID or to connect the upgrade to their ID instead of mine?
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Alan HendersonRetired marine engineerCommented:
Have you tried changing the Apple ID back to the original?
https://support.apple.com/en-nz/HT202667
Rahul MehtaApple certified TECHNICAL COORDINATORCommented:
It's  true as it reads the purchase history of their as that is loged in. U can also download the dmg of the update file from Apple.com/support and update the OS.

Search using this link:https://support.apple.com/en_IN/downloads
intoxicated_curveballAuthor Commented:
Alan - that won't work because both IDs are assigned as Apple IDs.

Rahul -  I don't see the OS download, only the update.
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serialbandCommented:
Try using another local account and then sign up to his ID to get the OS download.  Maybe some preference got corrupted and needs to be cleaned up.
intoxicated_curveballAuthor Commented:
None of the above worked. Apple gave me a redemption code, and that worked to reinstall the application that required update with the proper User ID.

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intoxicated_curveballAuthor Commented:
Apple support provided the solution.
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