Change the link of updatesite in the preferences windows
XSTAMPP: An eXtensible STAMP Platform for Safety Engineering
Brought to you by:
asimabdulkhaleq,
lukasbalzer
The URL link to update the application should be
https://sourceforge.net/projects/stampp/files/updatesite/
not
https://sourceforge.net/projects/xstampp/files/updatesite/
because the repository is stampp not xstampp.