[DiapDealer]

urllib.request uses the operating system's certificate store. It's entirely possible that Windows 10's certificate store is no longer valid. We may need to look into configuring the Windows Sigil bundle to include (and use) the certifi module by default to keep plugins that use urllib.request working on Windows 10.

Anyone know if there is a manual workaround to updating Windows 10's certificates?


EDIT: I realize that not being able to find epubcheck.jar might be the root cause here, but urllib.request not being able to get valid local certs from Windows 10 machines not getting any more updates should probably be addressed.

And Jon: if you say one thing about updating to Windows 11, your posts in this thread will be deleted.