I was noticing that epubcheck in Sigil does not offer me the update to 5.2.1 which fixes the regression that was flagging mailto: links as errors. I manually installed it back in January and didn't think about it until now when I did a new Sigil install on a virtual machine and got a mailto: error on the first epub I checked. calibre's editor did suggest the update.
Update check is true in the prefs file and last_time_checked shows as about 5 minutes ago when I last ran epubcheck.
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