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How to Solve the Tip Reads "Can not Install font.ttf file, 'C:WINDOWSFontsfont.ttf' is not valid"?

Here are the reasons:

A.The font can only be used in macOS, iOS, watchOS, tvOS, not suitable for Windows

B.The file suits for the older version of Windows not the new version.

C.The file has been broken.

Here is how you solve it:

You can transfer the file from TTF file into OTF file by Convfont provided by FontKe at : https://en.fontke.com/tool/convfont/.Basically, you will be able to use it.