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Error: "Can't download the additional components needed to install Mac OS X"

In the log: "Failed to verify Essentials.pkg: xar_verify failed"

I have an old iMac 5,1 that I'm trying to fix up. It has 3 GB RAM. I'm using a USB flash drive instead of a DVD as installation media, as I do not have any dual-layer DVDs. I wiped the drive using Disk Utility before installation. This iMac was successfully running Mac OS X 10.6.8 Snow Leopard before I tried to install Mac OS X 10.7.5 Lion. I have tried installing both with and without Wi-Fi.

Can't download the additional components needed to isntall Mac OS X

Failed to verify Essentials.pkg: xar_verify failed

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