at this link: https://www.nethserver.org/getting-started-with-nethserver/ you download the 7.5 as stable, why?
I guess someone forgot to update that link, thanks for pointing it out.
EDIT: moved this to #bug category.
The links are partially updated.
The red button and blue link underneath it point to the 7.5 ISO
The link under NethServer 7 points to the 7.6 ISO.
Thank you for pointing it out, should be fixed now!