>>66
11.Xの初版である11.0.0.6574で以下の説明があったから正しい挙動

This release aims to be Windows RS5 compliant, which is due in Fall-2018.
It has a change needed by RS5, when you update from older versions, after you have updated, you will see another alert for 2nd update.
So two pass update.
Any update further on top of this won't require two updates.
We have to go through this one time for technical reasons.