It's easy to run game with linux player...
download adequate linux player from
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and unpack it into game folder.
Install libpng12 from your repos or download
libpng12.so.0.50.0 from same folder, rename it to
libpng12.so.0 and place it into lib64 subdirectory.
Then just calling
would make the job, with native linux version. Co not use the convert script, as it would break update script created for linux (single call ./Update.. then, download just ~500M per release).