Hello every one
today i like to share with you what i could find after years of looking for one
PRO-SAP free fully featured Structural analysis software working on windows
www.2si.it
Your link gives me this adress: https://forum.freecadweb.org/www.2si.it
First time I see this free option: e-TIME version (only weekend from 20 to 8am) 
Only for vampires…
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