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Notepad++ Hijacked by State-Sponsored Hackers
(notepad-plus-plus.org)
This is a most excellent place for technology news and articles.
The article literally states that should you download the latest version from their site directly and then use the installer to update manually. Who knows if those who were effected already could have something else compromising the update/install process. I wouldnt update from the built in updater until the new fix with certificate and signature verification is released.