Error message while updating Workbench
Same problem here.
Solved this by mirroring the update repository locally using wget. You have to disable error checking for wget, too, otherwise it would complain about the certificate:
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wget --no-check-certificate --recursive --no-clobber --page-requisites --adjust-extension --convert-links --restrict-file-names=windows --domains www.ac6-tools.com --no-parent "https://www.ac6-tools.com/Eclipse-updates/org.openstm32.system-workbench.update-site-v2/"
The used the local update repository as an update site:
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file:c:\temp\org.openstm32.system-workbench.update-site-v2\
Hopefully this helps someone until the issue is resolved.