The Bootpack Season 1 by Tisera09 has been released, featuring boots compatible with PES 2019, 2020, 2021 and 2017-2018.
How To Install The Bootpacks In PES 17-21 Seasons: [Download]
1. Extract the archive and copy .cpk file to 2017-2021\download\ folder
2. Open and select DP in DpFileList Generator
3. Add .cpk as last checked, generate new DpFileList and enjoy game.