I just tried it today. had quite a bit of difficulty, lot of hit and trial. Managing with a sort of dirty workaround. Just download and untar the linux executables, and then download and unzip the complete distribution as you will need the parameters files from there. Then put the executables bin folder in the full distribution directory and copy the files as and where you need them.
Giussepi, to install the tinker, follow the instructions on this site: https://sites.google.com/site/biomolsimstw/workshop-materials/software-installation-instructions.