Logos 5 won't open after downloading resource

I just purchased Peter O'Brien's PNTC on Hebrews and typed "update all" into the command box in Logos 5. Then it downloaded a 45 MB update, and now Logos won't even open anymore! This is terrible; I was in the middle of my sermon preparation, and I am already chronically short on time. Please get back to me ASAP on how to fix this.