Trouble upgrading a PBW game to BM 1.09pbw

Two player game. We've been playing SEV version 1.35, BM 1.08, up until the latest turn.

We had the PBW admins upgrade us to SEV 1.58/BM 1.09pbw, and we both submitted our turns under the old versions.

I unzipped the BM 1.09pbs zip file, and let it overwrite the existing files in the BM 1.05+ directory.

The subsequent turn file, when highlighted in the "Load Game" menu of SEV, indicates SEV 1.58 and BM version 1.05. However upon loading, I got the error message indicating that the data files I have do not match the data files the game was created with.

Then, I tried completely deleting the BM directory and just doing a fresh unzipping of the BM 1.09pbw zip file. Now, when I try to load the game, it flat out just says it cannot load the .gam file.

Any help or suggestions are appreciated. This is a long game, past turn 130, and we'd really like to continue playing it. However at the moment, we are totally unable to load the game.

Do I need a "normal" BM 1.09 zip file to unzip first, and THEN unzip/overwrite using the 1.09pbw file? If so, where can I get the BM 1.09 zip file?

Thanks!