.

Maybe due to the region restrictions?

This package can NOT be purchased in specified countries
Albania, Belarus, Bosnia and Herzegovina, China, The Democratic Republic of the Congo, Cote d'Ivoire, Cuba, Islamic Republic of Iran, Iraq, Japan, Democratic People's Republic of Korea, XD, Liberia, Libya, Macedonia, Montenegro, Myanmar, Serbia, Sudan, Syrian Arab Republic, Vietnam, Zimbabwe

It's the most aggravating kind of yearly game release- with each new year's release, they apparently near-immediately remove the availability of the previous year's release, along with eventually shutting down that version's online servers.

You can view the announcement for the 2019 version detailing such matters here.

Your only option at the moment would, by my understanding, be this one:
https://store.steampowered.com/app/996470/eFootball__PES_2020/