Not sure if anyone else had this issue. I sort of followed directions on how to install using just the phone, but it was a no go. Long story short, I already had an update.zip and when I tried to rename what I downloaded from Google's servers Astro didn't give me a warning (or I didn't notice it). So I deleted the update.zip, and renamed the 2.2 update to "update.zip" and it seems to have worked.
Side note - I was not able to download the zip using the built in web browser, I used Opera which put the file at the root level.