What is the correct shasum of InstallESD.DMG for OS X 10.10 Yosemite?
The correct sha1 of InstallESD.DMG for OS X 10.10.0 Yosemite is eebf02a20ac27665a966957eec6f5e6fe3228a19.

There's no way to correct corrupted downloads, so you have to download it again.