Click on the link to download the .zip file. The graphical images inside the .zips are of small size and will need to be upscaled. There are many ways to do this, but I suggest using https://imglarger.com/. These aren’t vectors, so upscaling them in photoshop will just leave you with blurry images.
These images are created by me using a variety of tools, free to use for whatever project – commercial or non-commercial – that you have in mind, no attribution necessary.