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Visual Studio 2015 Update 2 has been released, however it doesn't detail any methods of upgrading from Update 1 to Update 2 - and no updates are shown for it in the 'Extensions and Updates' dialog.
Does anybody know the correct method of upgrading from Update 1 to Update 2?
I suppose that they forgot to put it inside the updates, you can download it from their web https://www.visualstudio.com/en-us/news/vs2015-update2-vs.aspx
A little late, but it appears you can upgrade through VS now. This seemed to work for me: under Tools > Extensions & Updates...
A window will pop up and on the left hand panel click on Updates.
You should be able to find the update there; mine had the label Visual Studio 2015 Update 2