Your first step in using AMPL/Gurobi link is to download the appropriate distribution for your platform:

amplgurobilink10.0.3_mswin64.zip: 64-bit Windows distribution
amplgurobilink10.0.3_linux64.tgz: 64-bit Linux distribution
amplgurobilink10.0.3_mac64.tgz: 64-bit macOS distribution

Extract the contents first. For Windows, extraction is done by unzipping the file. For Linux or Mac, it is done with the following command:

tar xvfz amplgurobilink10.0.3_{linux64, mac64}.tgz

After the contents are extracted, you should open doc/index.html and readme files, which provide instructions for activating license and completing installation, and user guide.