Crash Corrupted Project

I was working in Scrivener yesterday, and my laptop crashed (froze up completely, CTRL+ALT+DELETE had no effect).
When I rebooted and reopened my project in Scrivener, I get an error message saying this project is not compatible with this version of Scrivener. I was using Beta 1.4 yesterday. I just downloaded 1.55, but the error is the same. I cannot open the project at all.
Serious bummer. Several hours of work lost.