Joomla 6?

Sounds like you're missing the update for the component then. You should have SermonSpeaker 7.0.0 or higher.

It's strange, because not all plug-ins or extensions have been automatically updated to version 7.

Module SermonSpeaker at 6.1.0
SermonSpeaker Package at 6.1.6
SermonSpeaker - Categories at 6.0.2

I try to manually update from zip, but I have now theses errors:
Compile Error: Cannot redeclare class Mod_SermonspeakerInstallerScript (previously declared in /home/clients/34c248b5e849c0c10b03fe093be8f158/sites/lachapelle-vdj.ch/tmp/install_693499c3e954f/SermonSpeaker-7.0.1/mod_sermonspeaker/script.php:19)

You can certainly ignore the package one. That one is more like a dummy for when you install all at once. It won't be updated itself.
The others should work fine when doing them one by one. I had issues doing all updates at once for some unknown reason, looks to me like Joomla messes up something. I couldn't track it down yet.

If it doesn't work, try uninstalling the respective module and install it again. For modules and plugins it isn't hard to set it up again. Just don't do it with the component or you will loose all your data.

It's works thanks. I updated manually one by one.

Except the module SermonSpeaker Adminmodule. I have this error: Unexpected token 's', "script.php"... is not valid JSON

But I'm not sure I have already need it. All functionalities I use it works. The player works fine. Thanks

Great that most worked.
The admin module indeed had a bug in the script file. I have fixed that one now and you should see an update to 7.0.1 for that module.