I admit that I really adore the nextcloud application and I am using it extensively for my private backups. I use Slackware Linux.
Typically Slackware users compile the source code and bundle them in packages. Slackbuild shell scripts are normally employed. They are usually found on https://slackbuilds.org or other trusted repositories.
I drafted a SlackBuild for nextcloud-client. It is available here:
I prefer to include a link for the latest stable version of the source code. May I have the link please?