The user guide has not been updated in years.
I dont think it is supposed to be shipped with any edition these days.
The wiki has been neglected too.
( it also seems that the web master is creating spearate docs for some reason … docs.manjaro.org )
That all said … we cannot control OSDN and its up time.
It appears while I was typing this it became available again.
Though sporadically.
curl to the rescue…
curl -O osdn.dl.osdn.net/storage/g/m/ma/manjaro/Manjaro-User-Guide.pdf
I also re-uploaded it at 0x0.st so you may access it that way:
And I will warn again - the user guide is severely outdated. From ~2018 or so.