If official page still not supports - then go to https://github.com/diaevd/GnomeExtensionMaximusTwo
and click "Download ZIP" button
or use this direct link: https://github.com/diaevd/GnomeExtensionMaximusTwo/archive/3.18.zip
Also, you need to install "gnome-tweeak-tool" if you not installed this useful tool before
sudo dnf install gnome-tweeak-toolOpen gnome-tweak-tool application (for example, press Alt+F2 and type "gnome-tweak-tool"(without quotes)
Go to "Extensions" tab
Click on the "folder" icon in "Install shell extension" section (at the bottom of the list)
Select file "GnomeExtensionMaximusTwo-3.18.zip" downloaded on previous steps
Close "gnome-tweak-tool" application
Press Alt+F2 and type "r" (without quotes", press Enter
Open gnome-tweak-tool application again and go to "Extensions" tab
Enable "Maximus Two" extension using slider.