Version 1.01.00 includes squads frozen after the February 2021 transfer window, meaning players like Bruno Fernandes, Haaland, and Sancho are at their correct clubs (pre-2022 updates). It also adjusts formations based on real-world tactics from mid-season.
The German Bundesliga is notoriously absent from PES. Most version 1.01.00 Option Files include a fully built Bundesliga (Bayern Munich, Borussia Dortmund, RB Leipzig) with correct lineups, replacing the fake "Euro" or "Latin" league slots. Pes 2021 Option File Version 1.01.00
If you are looking for instructions or documentation for this version, here is the standard process for installing a compatible Option File: Installation Requirements USB Drive: Formatted to Folder Structure: You must create a folder named Version 1