Clarification about this matter gets confused because folks basically change the subject line within a particular thread. For example the thread here is called DATABASE QUERY ERROR.   :)

However in the above, Alex offered emergency service to manually update your Timeline. 

4 days ago VeganWolf wrote, which would leave me to believe this Timeline issue was now resolved: 

If we see RC6 installed and RC8 update available. It doesn't mean we're skipping... even though it looks that way.
In reality... if you click, it will apply RC7 first
Refresh, you'll see RC7 installed
Perform modules updates ( ignore Timeline )
Then click once more to RC8, it will apply RC8
>>>  And lastly, don't forget to perform Timeline module update.