I tried to update mavericks 10.9 to os x yosemite but unfortunately it is was unsuccesfull. it was no any back up before i update. so, here now is the problem  i try to install back the mavericks as per apple says, but reinstalling fails,

i tried to update mavericks 10.9 to os x yosemite but unfortunately it is was unsuccesfull. it was no any back up before i update. so, here now is the problem  i try to install back the mavericks but the computer say "it could not find installation information of this machine or the request timed out"
what should i do?
pls help me.
os x mavericks 10.9 macbook air

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