The skin is designed to be more of a throwback to other skins.
For example, the main layout (titlebar / sidebar / action bar) has been rebuilt from Helveticalite, a favorite from FM15, as well as the manager home panel being a throwback to the days of FM15.
More updates may potentially follow but don't expect anything either.
TCS Glass Screenshots
How to install the TCS 2020 skin
Please note this skin is provided as is. It has nothing to do with Sports Interactive or SEGA and won't be supported by them.