How can I delete previous owners ID from iMac without original media?

Hi there,
Hope someone can help me as I'm relatively clueless!
We have purchased a 2nd hand iMac from Amazon and have been trying to download from the Mac App Store, we both have Apple IDs but when we are trying to download/purchase an app that was previously downloaded by the last owner it is only giving us the option to Accept and not purchase, after signing in it then gives us the error message that it has already been downloaded to the previous ID and if we want to download it we need to re-purchase it, which is fine.
So my question is how do we do this? we did not get any original media in the box so cannot factory reset and redownload.
Fingers crossed someone has the answer as I'm itching to get on and use the machine!!
Thank you in advance,
Vicky.

Hi Vicky ...
Since this is a 2nd hand iMac, you can reformat the drive by using Lion Recovery
That will delete all the personal data from the previous owner so you can start fresh from factory settings.
we did not get any original media in the box so cannot factory reset and redownload.
New Macs do not come with optical media.

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How can I delete previous owners ID from iMac without original media?

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