Thank you for downloading this font from CubicType. It is available free of charge even though you may have made a voluntary payment for it. Included with these font files is a desktop licence that includes commercial use but does not permit you to violate anyone's human rights. See the licence file for details.
macOS: Double-click the font file to open it in Font Book and select the "Install Font" action.
Windows and so on: I guess double-click the thing?
You are allowed to have fun with this font. In particular in your art, stickers, movies, books, socks, shop signs, and so on. This is not an exhaustive list.
You are not allowed to distribute the font in any way. In particular you are not allowed to embed the font in an app, video game, eBook, nor incorporate it into any sort of content creation platform to make stamps, templates, or customised text. This is not an exhaustive list.
It is easy to get a different licence agreement. E-mail me at drj@pobox.com and bring a budget of at least USD 50.
If you have spent more than USD 20 on this font then i can offer a free glyph. At your request i will design a glyph of your choice and add it to the font. Simply e-mail me at drj@pobox.com with proof of purchase. This offer is subject to somewhat vague but reasonable terms: the glyph must be a standard unicode character not already in the font; it must be consistent with the general style and script coverage of the font. i will not be drawing Hanzi characters in a Latin script font.
Please browse more fonts at about.cubictype.com.