Hi Jessica,
You wouldn't necessarily need to hotspot it, but you would need an internet connection to download. You could download the file on another computer, and transfer it to the Surface by USB drive, for example.
The file that is being downloaded is a .msi installer file, so when you open it, it should bring up a setup wizard that walks you through the installation steps, and that would handle the installation of the drivers. Once that installer is complete, it will likely ask you to restart, and then the latest drivers would be installed.
Let me know if that makes sense or if you have any other questions!
-Ashton