On macOS you must download them and then manually move each one outside of your Downloads folder to your Desktop to get Gatekeeper to not try to move them for security purposes.
It is not the plugin itself that is generating that error message, it is the Sigil plugin wrapper code. It will report exactly that error if the plugin you are trying to launch is being secretly moved behind the scenes when run the first time due to Gatekeeper.
My guess is Gatekeeper is also playing around behind the scenes with Sigil too when it is run the first time after installation.
Not sure why it happens on Windows though?
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