I cant update my macos 10.7.5 , it says not recognized what can i do , I downloaded it 3 times but its not working

need to update to OS 10.7.5 and the messge i get is format not recognized

missanoshka,
if you select the MacOSXUpdCombo10.7.5.dmg file which you’d downloaded, and press ⌘i to Get Info on it, what information is shown for it under ▼ General: Size? My initial guess is that you could have an incomplete download of that file.

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