Konami, the developer, periodically updates the game executable (the .exe file) to patch exploits and add data packs. For the average player playing on an unmodded Steam version, this is a seamless process. However, for the modding community, these updates are disruptive.
If you are using a patch made after 2023, check its documentation; they likely have already solved the 1.07.02 problem internally. Pes 2021 Bypass 1.07.02
If you accidentally updated to 1.07.02 and cannot get Sider to work, you can downgrade your game files using the Steam Console. This bypasses the patch entirely by reverting to 1.07.01. this is a seamless process. However