This looks like anti-virus software removing some files.
I suggest you try the latest pre-release Excel-DNA package (1.7.0-rc6).
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Did you update the versions of the ExcelDna.Registration and ExcelDna.IntelliSense package references to be the same as ExcelDNa.AddIn?
Are all of these now 1.7.0-rc6?
To be clear, the IntelliSense worked for this project before?
And the add-in itself works, except for the IntelliSense?
And you are calling IntelliSenseServer.Install() from the AutoOpen.
Also, the Sophos anti-virus message you show should give you a problem, I’m not sure why it still works after that.
I’ve just made a test project with v 1.7.0-rc and the IntelliSense, and everything seems to work fine.
The repository is here, if you want to try: govert/TestIntelliRc6 (github.com)
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