Last-minute tax panic

So I had my federal and state taxes all worked out this weekend and was just doublechecking the figures and adding a few bits of trivia (my EIN, for example) and getting ready to file electronically tonight. Turns out my copy of TurboTax did not have one current form (8880 – related to 401k tax deferral in my case) and requires an electronic update before permitting me to file.
Problem is, the update keeps fizzling out before it’s done. The alternative at first seemed to be filing by mail, something I bought the software partly to avoid doing. Fortunately, I poked around the website and saw that there is a way to download the update manually, which is what I’m doing now.
Knocking on wood, fingers crossed, I should be able to file both before the midnight deadline tonight.