You can also check the version of the assemblies from the File Version attribute, which aligns with the NuGet version. Notice that even though the NuGet version is increased to 5.12000, actual assembly version of the released assemblies is 16.1.0.0. Previous versions of the NuGet have not been removed so that your existing solutions will continue working without issues and you can decide when the new version is taken into use. The version of the newly released CSOM package is 4.12000. We do recommend you to use the NuGet Package to gain access to the latest version, rather than downloading the SDK to your machine as we do not update the separate MSI installer for SharePoint Online CSOM anymore.
You can find the latest CSOM package for SharePoint Online, including the Project Online CSOM assembly, from the NuGet gallery with an id of ‘ ‘. This release is mainly a small maintenance release with a minimal set of changes in the CSOM API and PowerShell cmdlets. We are happy to announce the availability of new SharePoint Client-Side Object Model (CSOM) version targeted for the Office 365 or more specifically for SharePoint and Project Online.