That has nothing to do with AMXX , if you don't even know how to Unzip things , you're going to have a lot of problems. Well I'll tell you anyways.
1. Create an Addons folder and put it in your CSTRIKE folder.
2. Download the Amxx 0.16.zip download. Open the file and unzip all the files into your CSTRIKE / ADDONS folder that you just made.
3. Your done , continue to follow the other steps which are
EASY.