"Start update" button not working


i tried to update today from 13.0.1 to 13.0.2. via the built-in updater. It worked fine but when it came to the point where i had to click the “Start update” button, nothing happened. The button seems to have no effect at all.
I read about this issue here and on other forums but the only solution seems to be to start the update manually via tha command lin. But my nextcloud is running on a shared hosting service, so i don’t have access to a command line.
Any ideas what to do?

The manual commands would be preferred since on the web interface, you can run into timeouts. Can you check your logfiles for errors, perhaps they tell you more.