![]() So I assume the issue is that the old Mac is running a newer Software Update. I'm just running Mavericks, up to the newest software update. I've found sources saying this can happen when you upgrade to Yosemite, but I have not done so. Your Mac requires an upgrade before you can migrate from this source. This source contains a newer release of OS X. The old Mac appeared on the new Mac's migration screen, but with a warning sign over its icon. ![]() I just bought a new 15" MacBook Pro, brought it home, followed the Migration Assistant instructions on my old 13" Retina MacBook Pro running Mavericks (which explicitly say to install all software updates on the source machine before migration I did so, including an OS X update), powered on the new computer, and when prompted to do so connected the two via Ethernet (using two Thunderbolt adapters I do not have a Thunderbolt-to-Thunderbolt cable).
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