The executable will only run on a 64-bit system. If you have a 32-bit system you will have to build the source yourself.

Ubuntu instructions

sudo add-apt-repository ppa:texus/tgui

sudo apt-get update

sudo apt-get install libsfml-dev libtgui-dev libcurl3

Run the executable! If you run into problems, try running ldconfig to update your dynamic linker runtime bindings.

Other linux distros

You need SFML, TGUI and libcurl to run the executable. Check if it's available from your packet manager, otherwise follow the links below.

SFML

Here you can download the library, or you can build it yourself.

TGUI

This you will have to build from source. You can download 0.7.3 here or follow instructions here

libcurl

Select a none-binary type, since you need the library.

Still does not work?

Try building the executable yourself. The source is right below the binaries on the release page.