You can normally install the fonts just by executing them and selecting the install option, but you can also manually install them by just dragging the files or copying and pasting them into your system's Fonts folder. Here's how to locate it:
- On Windows: first locate your Windows operational system folder (it's a folder named "Windows" inside your default local disk, usually C:) and look inside for a folder named "Fonts". The path will be something like this: C:\Windows\Fonts
- On Mac: the Fonts folder will be inside your Library folder. This is how the path to it should look: [username]\Library\Fonts