According to the official patch notes from SteamDB and FM Scout , the update included:
Most of the 20.4.0 fixes are , meaning they will apply to existing careers automatically. However, any database-specific changes —such as updated rosters, manager changes, or league rule updates—require a new save to take effect. Popular Tactics for Version 20.4.0 Football Manager 2020 20.4.0
Football Manager 2020 February Transfer Update 20.4 Out Now! According to the official patch notes from SteamDB
: Tweaks to lighting for both live matches and Newgen faces to improve visual realism. Football Manager 2020 20.4.0
: Highly effective for fast, direct football, focusing on high tempo and urgent pressing.