about new feature in libreoffice 5.3 (libreoffice online)

users
#1

--
we have not sent you but as a mercy to the creation.
holy quran, chapter 21, verse 107.
in the very authentic narration is:
imam hosein is the beacon of light and the ark of salvation.
best website for studying islamic book in different languages
al-islam.org

hello every one.
i have questions about libreoffice online.
how does it work?
does it need separate version of libreoffice to download rather than
normal version?
or does it some changes in settings to work?
i opened the given link, but i could not understand whats it, because
of the sanctions against iran unfortunately.
i realy wish to know about it and also is it possible to use it in
previous versions of libreoffice or it works only in 5.3?
i tried this link, but without any success.
https://hub.docker.com/r/libreoffice/online
also i realy love the previous ui version of libreoffice website.
it was previously more accessible and more simple to use.
i appreciate your help, pray for you and request divine mercy and
blessings for you.