Cannot setup Mountain lion on Macbook air 2013 (Mountain lion is not compatible with this computer)

I just bought Macbook Air 11 inch, mid 2013 model.
after first setup, and restoring from another time machine, I discovered that the battery is poorly performing, so decided to install fresh mountain lion. using my previously prepared USB drive failed. so tried to download the mountain lion all over again from the store, where it said, mountain lion is not compatible.
as per the below picture
I want to reset my mac and install a fresh copy of mountain lion, Pleae help,
Thanks,
Fawzy

VikingOSX wrote:
The build of Mountain Lion (10.8.4) on your 2013 MBA is newer than what is currently available from the App Store. That accounts for the App Store blocking you. This will likely be resolved with the introduction of 10.8.5.
True, but even so, there is no need to re-purchase and download from the App Store (not to say you're implying this, but rather just for informational purposes). When OS X 10.8.5 is released, the Software Update service will be the way to install the update, and not the retail Mac App Store.
Hopefully, if mawy did re-purchase Mountain Lion, when Mavericks comes out then Apple will offer it to mawy for free (it's slated to be out soon).

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