I went to the panel and see that an update is available, but there is no update button

after a while I found Maintenance intervals and started the update.
It's been 20 minutes but the version hasn't changed.
here log.
[19-May-2020 15:11:01] INFO --> maintenance log okay
[19-May-2020 15:11:01] INFO --> trying to connect to updateserver
[19-May-2020 15:11:02] INFO --> set correct tmp-directories mount for update
[19-May-2020 15:11:02] INFO --> new version detected - starting update process from "20.0" to "20.1"
[19-May-2020 15:11:02] INFO --> first update step: "20.1" | total steps to reach latest version: 1
[19-May-2020 15:11:02] INFO --> create folder for panelupdate "/home/keyhelp/www/keyhelp_tmp/"
[19-May-2020 15:11:02] INFO --> start download of "https://install.keyhelp.de/files/releas ... p71.tar.gz"
Update:
I went to the keyhelp_tmp folder and found that the panel was downloading incredibly slowly 1.5Mb in 25minutes


Update:
now it has completely stopped, only 4 megabytes have been downloaded
