You can get the offseason FMS
here.
Be sure to read the user's guide- you will definitely want to read it to get as close as possible to the same network configuration as the field.
That being said, you won't be able to easily replicate the exact conditions of the field. The full FMS does a lot of fancy work to set up subnets for each team, closes off many ports, and a few other things.
Some scenarios (such as your laptop thinking the network is a "public" network as Alan mentioned) are also hard to trigger at home because they are very dependent on the network itself (though in that case disabling the firewall globally will fix it for all networks).