I have 2 Apple ID's but the app store will not let me update iPhoto with either

I have a MacBook pro 2011. For some reason i have ended up with 2 Apple ID's i must have forgotten something or i changed my account name from when i first set up the machine. Some apps allow me to upgrade with one but not the other. I have upgraded to Yosemite via a clean install at the Apple store. I have loaded back on my back up but iPhoto isn't there and it has asked me to upgrade via the App store. Unfortunately neither Apple ID's will let me upgrade.
The Message on screen is:
Upgrade 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
Do i head back to the Apple store and talk with them or is there something i can do at home?
Thanks in advance of any help
S

I think you're confusing RAM memory with hard drive memory storage...the two aren't the same. 
Although you're being told you need 2GB of RAM to run Mountain Lion....I would consider 4GB the minimum.  You should be able to upgrade the RAM in your iMac to 4GB for well under $100.

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