The Release History page shows notes only for the official releases and service packs. The Latest Internal Builds (LIB) doesn't have release history. Those notes goes live with the history for the official releases.
As for the dlls, can you tell me how exactly you update the project? By "Include Internal builds in Latest Version update and retrieval" I guess you mean the checkbox in the Telerik Visual Studio Extension's Options menu? If this is the case, then you will need to use the Upgrade Wizard in order for the checkbox to get taken into account. Can you try upgrading your project with the Upgrade Wizard and let me know how it goes? If this doesn't help, can you please send me the project you are using so I can check it on my side and see what happens?
Another thing that you can check is your license activation period. The license assigned to your account (the one used to login in the Telerik nuget server) must be active. Otherwise, you won't be able to download the latest versions (only the ones released during the activation period).
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