Memoir

• How to Download and Install the memoir Class in MiKTeX
  Install the memoir LaTeX class in MiKTeX through MiKTeX Console, or download its distribution from CTAN and verify it with a test file.
• How to Set a 13pt Font in the Memoir Class
  The memoir class does not provide a 13pt class option. Use the fontsize package to set 13pt body text, with a suitable baseline skip.