Windows 8 Windows Release Preview Evaluation Copy Expired

I downloaded Windows Release Preview Evaluation Copy. Build 8400. Now I am getting messages that says my version has expired and to download the newest version. The newest version requires a payment. This seems like a bait and switch. Windows says I can't uninstall Windows 8 and go back to Windows 7. Plus when I installed Windows 8 it erased all my previous files. How can I continue with Windows 8, or can I go back to Windows 7? Thank you. My message says that my pc will stop every 2 hours until I get the newest version. Doesn't seem fair.

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