Downloading this file type is no different than any other file type. It’s what you want to do with the file after.
For new fonts in Windows
Click on Start, Select, Settings and click on Control Panel.
Click on Fonts, click on File in the main tool bar and select Install New Font. Select the folder where the font is located. The fonts will appear; select the desired font that is titled TrueType and click on OK. Click Start and choose restart the computer.
Depending on your version of Windows you may also
Right click on the TTF font and choose install.