i tried to install the game and i have this error
gog_eschalon_book_i_2.0.0.5.sh: línea 509: ./startmojo.sh: Permiso denegado
i tried to install in user mode or sudo, and the error is the same.

Try opening your Terminal, type (without quotations) "chmod +x"(SPACE) and copy/paste the directory of your installer (example: chmod +x /home/username/Downloads/gog_eschalon_book_i_2.0.0.5.sh) press enter and run the installer again.