Download the .zip archive and use a tool such as 7-zip for Windows or The Unarchiver for MacOSX to extract its contents.
Move the extracted folder "EVO FM 2021 Skin" to your skins folder:
\Documents\Sports Interactive\Football Manager 2021\skins\
Run Football Manager 2021 and go to Preferences > Interface.
You should see "EVO FM2021 SKIN” as an option in the skin drop down of the General options section.
Hit the Confirm button.

http://www.mediafire.com/file/27k56l...2020.rar/file?