Open the GitHub repository page
Click the green Code button
Select Download ZIP
Save the ZIP file to your device
Extract the ZIP file after the download finishes
If you need a specific file, open it in the repository and click Raw
Right-click the Raw page and choose Save As
If you want to use Git, copy the repository URL from the Code button
Open a terminal or command prompt
Run git clone repository-URL
Wait for the repository to download to your computer