The Windows version should work on all Windows versions after Windows 7, either 32 or 64 bit.
For linux you need at least an Ubuntu 16.04. The program is built to be distribution independent, probably any Linux that's 64 bit, after 2016 should to. GermaniumHQ supports only Ubuntu though.
Germanium is a software project made by a passionate team in Vienna, that aims at making integration testing a breeze.