The PES community is still active! Look for the "PESEdit.com 2011 Patch" to update the rosters, kits, and transfers to the current season.

Use a tool like QuickSFV or 7-Zip to test the archive. The hash should match: MD5: 4f8b2c9a... (listed on the download page).

This is a delicate topic. Konami no longer sells PES 2011, and the licenses (UEFA, Premier League, etc.) have long expired. Many abandonware advocates argue that downloading a game that is commercially unavailable is ethically acceptable, especially for preservation.