Server updated, Clients are not Auto-updating to newest client version 2.5.27

So I just upgraded my urbackup Linux server to the latest version, 2.5.35

I have about 20 Windows clients running 2.5.26

I was expecting my clients to auto-update them self too the latest 2.5.27 version.

looking at the Server my server_version_info.properties is still saying that its running 2.5.32

the version.txt still says version 291

I have deleted both files on the server, and restarted the serevr. the files get re-created by the server , but still with the old version.
urbackupsrv --version
shows UrBackup Server v2.5.35.0

Did I miss somthing here?

If I manually update a the windows client everything works fine as far a backing up. but the rest of my clients will not auto-update