Unzip and upload this file to components/com_jevents/libraries/ and it should resolve this issue

I will issue a new release with the fix soon

Thanks for your help!
But actually, on importing the events, I get still an error:
Es ist ein Fehler aufgetreten.

0 Non-static method iCalImport::unixTime() cannot be called statically

Call stack
# Function Location
1 () JROOT/components/com_jevents/libraries/iCalEvent.php:456
2 iCalEvent->cancelRepetition() JROOT/components/com_jevents/libraries/iCalICSFile.php:572
3 iCalICSFile->store() JROOT/administrator/components/com_jevents/controllers/icals.php:442
4 AdminIcalsController->save() JROOT/libraries/src/MVC/Controller/BaseController.php:678
5 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/administrator/components/com_jevents/jevents.php:274
6 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
7 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73
8 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
9 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:143
10 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:186
11 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293
12 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:61
13 require_once() JROOT/administrator/index.php:32

Try this build

PHP 8.2 is causing more headaches than any php release in the last few years!

Great! Thank you so much! This release is working properly!
There only one litle thing in both releases: ical_custom_timezones.php isn't been loaded.
I have to add custom time zones manually to the iCalImport.php.
For me, this is not a big issue, but maybe someone knows a solution...
Best regards!

I just tested the ical_custom_timezones.php in components/com_jevents/libraries/ and it loads correctly.

What do you have in your custom file?

You could add this to the file to throw an intentional error to show that it is loading

die("here");