If you have Android, you can download the free SCID app. Then, you can download the free weekly TWIC, This Week In Chess, every Monday night. There is also a backlog of TWIC collections. The SCID database app can search and sort by a single ECO code, or a range of ECO codes. You would have thousands and thousands of games to study, all for free. Otherwise, I don't know where there is a collection of pro games here on Chess.com. The SCID app comes with Stockfish 6.
how can i find archived games of pros?
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id rather study openings by using the chess.com app on my phone and looking at the lines they play, i remember doing this before, where can i find old games?