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To speed up file search, MiKTeX makes use of a list of known file names. This list is called the file name database (FNDB).
It is necessary that you refresh the file name database whenever you manually install TeX/LaTeX-related files in a user-managed TEXMF directory.
You can update the file name database with the help of MiKTeX Console. If you prefer the command-line, you can use One MiKTeX Utility (see miktex(1)).