Make sure your fonts are not zipped. If they are in a .zip folder, you must double-click the folder and extract the font first. Take careful note to where you save the font.
Select the font file then right-click. Choose Install.
A thin Font is a single-line font. A person can put a pen, crayon, or a number of tools right into the "claw" of a cutting machine rather than a blade and use the machine to "draw" instead of "cut". When you do that with a regular font (.ttf or .otf) the machine traces the outline of the font so rather than having a single line, you get a double line.
When you use a font (.ttf or .otf file) on your computer, it will typically look something like this example (unless it is an outlined version of a font):
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