How to install in an older version?

Error: Failed to synchronize cache for repo ‘updates’

with or without --refresh,this is why I said it is broken.

How to change default dnf server country

Now update is working,the most useful part is

and modify the repository file in /etc/yum.repos.d

Updating is slow,if it can be done this way,but it is LXDE version seems to be discontinued,should I go all the way up to latest?

There is still error,not found deltainfo and not found updateinfo.
Also no match for arguement dnf-system-upgrade-plugin.