The Linux version of the Downloadpage doesn't link correctly.
For the link it should be called OpenRCT2-0.3.1-linux-i686.tar.gz instead of OpenRCT2-0.3.1-linux-i686.gz as well as OpenRCT2-0.3.1-linux-x86_64.tar.gz instead of OpenRCT2-0.3.1-linux-x86_64.gz