Aero Lite Theme in Windows 10 & 11 contains the Theme files for the classic Aero Lite Theme.
Download 'Install Aero Lite Theme in Windows 10' and extract the files.
There are 4 files included—two for the current user and two for all users.
Aerolite Theme - Current User.theme Aerolite Theme - All Users.theme Aerolite White Text Theme - Current.theme Aerolite White Text Theme - All Users.theme
Double-click on one of the 2 you'd like to apply for the current or all users.