The software program Polymake is not distributed with Macaulay2, so to use the Polymake commands the user needs to install Polymake on their own machine, and tell Macaulay2 where to find it. This is done with the Configuration option "polymakeCommand". The default is that this is empty, which means that Polymake options will not be used. To tell the package where your copy of Polymake is installed, use either loadPackage("Tropical",Configuration=>\{"polymakeCommand"=>"YOUR COMMAND"\}), or edit the init-Tropical.m2 file (created after you install the package) by changing "polymakeCommand" => "", into "polymakeCommand" => "YOUR COMMAND"
On a Mac, the default value for YOUR COMMAND is /Applications/polymake.app/Contents/MacOS/polymake.start and the init-Tropical.m2 file is usually in ~/Library/Application Support/Macaulay2.
On Unix, the default value for YOUR COMMAND is /usr/bin/polymake and the init-Tropical.m2 file is usually in ~/.Macaulay2. If polymake is installed in a nonstandard location, you can find YOUR COMMAND with the terminal command "which polymake".
This package should work with Polymake versions > 3.2, and has been tested up to 4.2.