One possibility:
1. Download the zip file from the website.
2. Unzip the file (into a default folder somewhere - often in the "unzipped" folder).
3. Examine the contents of what you have unzipped. Often there is a readme.txt or some other word document which tells you where in FS2000 you need to move the files to.
If there is no instruction file, maybe check where you downloaded the zip file from - sometimes they have instructions on where to unzip to.
Hope this is a start...