PRO_SAP for Windows® download. The setup allows to install the commercial versions or the free versions: Start-UP, e-TIME and Entry. Free versions are suitable for commercial uses.
Entry version allows to model structures up to 150 nodes.
e-TIME version is available all the day on Saturdays and Sundays and from 8 p.m to 8 a.m. GMT+1 the other days of the week.