is that zip a real zip that should be extracted, or is that installed in recovery?
The file you may have stumbled upon is the actual bootanimation.zip file that is located either in data/local or system/media
This is not an update.zip format file to install from recovery.
If you have the file, merely copy and paste it into one of the two directories mentioned above via a file manager like Root Explorer.
If you put it in system/media..make sure there is nothing in data/local as when the phone boots...the data/local folder is checked first.
I think jrummy puts his bootanimations in data/local anyway so more than likely that is where the original file will be. Delete it, then paste the new one in there.
Reboot...all done