No. The official Laszlo Polgar estate does not sell a standalone PGN of just the middlegames. However, the long answer: The community has reverse-engineered the book. You can find user-generated databases that extract the FEN strings (the position codes) and compile them into PGN format.
Includes fundamental patterns like epaulet mates, back rank weaknesses, double attacks, and various piece sacrifices (h7, f7, etc.). Laszlo Polgar Chess Middlegames Pgn
