I have not played the download version. The Windows version allows you to save hundreds of games. Have you been saving games along the way?
There are some known unfixed (as far as I know) bugs in the original game. But load a saved game from some point before the problem and play again often got me past the temporary problem.
Many (most) of the Prince of Persia games give the player ample chances to save a game so that you may replay from that position and level in the game.
I encountered probably five different stumbling blocks along the way while playing and replaying the game over the years.
Good luck with your replaying.
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