Ubuntu 16.04 version not found

Is there no more supported version for Ubuntu 16.04? That’s what I get if I try install:

W: The repository ‘http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04 Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04/Packages 404 Not Found [IP: 2001:67c:2178:8::13 80]

Please note our policy regarding OS versions:



The announcement of 2.6.1 client said it was the last release to support Ubuntu 16.04 –
now with 2.6.3 we remove that old LTS.

We still have 2.6.1 with Ubuntu 16.04 available at https://software.opensuse.org//download.html?project=isv%3AownCloud%3Adesktop%3Aclient-2.6.1&package=owncloud-client

Would that work for you this way?