NHL 20 was released exclusively for PlayStation 4 and Xbox One.
The last official PC game, NHL 09, has an active modding community. Groups like Wasserlasser have created total conversion mods (e.g., "NHL 20 Full Modded Game") that update the rosters, jerseys, and graphics of NHL 09 to match more recent seasons. nhl-20-download-free-pc-game
Be extremely cautious of any site offering a "free full game" download for NHL 20 on PC. Because a native PC port does not exist, these files are almost certainly or scams designed to collect your personal information. NHL 20 was released exclusively for PlayStation 4