MacBook Air Flash Storage Firmware Update / OS X Mavericks

I have MacBook Air with OS X version 10.7.4 and want to upgrade to OS X Mavericks. To be able to do that I have to install MacBook Air Flash Storage Firmware Update 1.1. BUT, to be able to install this firmware update, I need to have OS X 10.8. So, I thought I had to do this in to steps. First upgrade to 10.8, then update the Air Flash Storage Firmware and then finaly upgrade to Maverick - but I can`t find OS X version 10.8.0 anywhere. Only 10.8.5, but to install this I have to have 10.8.0 ...

Where can I find OS X version 10.8.0 Moutain Lion? Or is there another fix to this problem?