Thanks, the script has brought me a step further. It sets the library path to the base dir of the game. But still when trying to start the following error appears:
./ExeLinux: error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory
I searched for libpng12.so.0 but this seems to be missing and was not coming with the download.
The new download I cannot open at all. It seems that the gz contains another gz that cannot be extracted.