sketch-image-compressor
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“optipng” cannot be opened because the developer cannot be verified.
Title says it all, did some Googling but can't find a clear answer.

I had same issue when I installed it by downloading and double clicking the downloaded plugin from the download folder. I uninstalled it and installed it again via Sketch Runner, which resolved the issue.
Same here but for jpegoptim

Never happened before but after the latest macos update.