at some point along the way the "update VC+++ projects" disappeared, or at least I could not find labeled as such.
I have VS2015, and for me I right click the solution, in the drop down menu I select "Retarget Solution" and that gives me the option to update all projects. Else I have to do it singly
Picture of drop down window
Maybe I am missing something or someone else has a better way of doing it, but that has been working for me.