Please try the offline installer.
First, install the checkpoint update which is a prerequisite for KB5050009: https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/d8b7f92b-bd35-4b4c-96e5-46ce984b31e0/public/windows11.0-kb5043080-x64_953449672073f8fb99badb4cc6d5d7849b9c83e8.msu
And then install KB5050009. https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/66557ecc-650e-4c70-8baf-c624c4de912f/public/windows11.0-kb5050009-x64_97aac2ab4f607b11d50ad2fd88a5841ee0b18dd5.msu
Thanks but when I open the checkpoint file I get this message:
What documentation does it refer to and where do I find it?