Yes, I think 46..Kd8 would have saved you. A tough loss.
My first round loss at the World Open
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You were not forced to trade the bishops at all (move 16). If you played 16... f7-f6 you should have saved your bishop and there was no chance for white to get his queen in the center.
22... Rd6-d7 is waste of time. It was not necessary to move your rook. 22... Qb6-c7 would give you much better chances.
26... f7-f6 blocks your own king to go to the center. Moving your pawns does not give you any chances. In the endgame a king is more important than a pawn. After your own move the winning chances have moved to your opponent.
27... g7-g6 is waste of time. You are not able to win because of your pawns, but because of your better pieces.
28... Rd7-d6 is waste of time. White's passed pawn after 28...Rd7xd4 is not dangerous because the white bishop is not able to move to a dark square. You could have blocked the passed pawn with your king. You were lucky with the waste of time from your opponent, with 29. Kd3-c3.
32... Ke7-d7 is also a big mistake. After this move, your rooks are no longer threatening to take on d4 (when the bishop moves). If you played 32... a5xb4 your opponent was not be able to move c4-c5 anymore! The passed pawn on the white square a2 is not dangerous.
Your analysis of the 41st move is good. But also after R2b7 your opponent has all the winning chances.
where can I find the PGN of that game?
You played well but missed the critical 9...dxe4! which avoids the pawn chain and even if white avoids losing the exchange with 10.Rb1 black has 10...dxf3 11.Bxf3,Bh3 12.Re1,Qa5 laying the foundation for some tactical pressure as black is more active, his rooks are connected and the position is quite open.
10...Nb4! looks equal as it blunts white's potential to win the pawn with Ba3! After winning the exchange white actually won some pawns (white has 8 black has 6) and not only has material but a nagging positional edge. His pawn chain and bishops complement each other. An obvious reply one needs to look at is the natural 11.a3, but 11...Na2! 12.Ne4,Nxc1! (exchanges a knight that moved many times for a bishop that never moved, but it isn't what leaves that matters but what stays on, white no longer has his darksquared bishop to challenge yours and the chain is the same color as white's remaining bishop) 13.Qxc1,Bg7 14.Nxc5 still with the loss of two pawns for the exchange, but here black has positional compensation for it in an unclear position.
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I had an interesting game in round one of the World Open! I lost, but I thought i'd share nonetheless.