Just spitballing here...
I created a new folder in Astro root (/sdcard). I copy and pasted the different files from the download into that file (which I named "update"). Then I restarted.
Nothing. Still @ 2.01.
You DO NOT make a folder. You do not open update.zip and copy and paste the files within anywhere.
Place the actual "update.zip" file IN /sdcard.
That's it.
Then boot into recovery per instructions and try to update.