Service pack 4 Exchange Server

I would like to install service pack 4 for exchange server. I downloaded the 13 compressed files, but when I tried to unzip them, I get an error message about the drive being full. The files are huge! Is it necessary to install all 13?

Also, the instructions say to uncompress the files to a folder on the local drive. Isn’t there an install to execute after i unzip the files? The instructions said nothing about this.