Update to 25.0.2 -> An error occurred

Hello together,
i am trying to Update my nextcloud to Version 25.0.2 (current Version 25.0.1) and i am constantly getting the following error druing the webbased updater:

The updater.log shows no error and ends with the following line:
2023-01-03T20:37:43+0100 abcdefg [info] endStep(“12”)

Because of my hoster (all-inkl) i have no ssh access to the server, only ftp and web based access.
What can i do and where can i look for further logs?

Hope someone can help me.
Thank you!