A modern icon theme for Xfe file manager, based on the famous Papirus icon theme [add-link-here].
Clone the repository or download the latest version from the Releases page
If downloaded from the releases page, unpack the zip file
Open a terminal
cd Downloads && sudo mv xfe-modern-win /usr/share/xfe/icons
Go to Edit --> Preferences --> Themes
Under 'Icon theme path' replace
/usr/share/xfe/icons/windows-theme (or whatever theme was set)