Thanks for sharing those free skins.
Haven't tried it yet but yes, all skins should be compatible between Win & MacOS, here is a reminder for people who would like to install new skins on both systems :
How To Install Skins for ANA 2 :
Just unzip the ZIP package into ANA 2 GUI folder, those skins are self contained into a folder, you will then have a new skin folder ( i.e 'Soft Blue Black' or 'Sunshine Yellow ) next to the additional 'Black' one.
After adding the new skins, just open an instance of ANA 2 and click the "wheel" icon above 'Menu' to access settings and use the 'SKIN SELECT' drop down menu to see & load your new custom skin.
Installation Paths :
WINDOWS Users : C:\ProgramData\Sonic Academy\ANA 2\GUI folder.
MACOS Users : yourmacosHDD/Library/Application Support/Sonic Academy/ANA 2/GUI folder.