SharePoint Online: How do I set the Web.AlternateCSS property in CSOM?

The properties are only exposed in the '16' (SharePoint Online) version of the client side dlls. You will need to change your references to point to

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll

and

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll

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