For private use and education the eComStation version 2.x is free! The original files can be downloaded from the eComStation website as well OS installation files (iso) * https://archive.org/details/ecomstation2.1 OS key file * https://archive.org/download/ecomstation2.1/eComStation%202.1/ecs20reg.key A complete installation instruction can be read under https://www.inter-net.de/