I have just upgraded my 10.2.2 to 10.3 and installed the ArcObjectsSDKNet. I have Windows 7 Enterprise edition (SP1) and am a local administrator. The ArcGIS templates have all disappeared from Visual Studio and the help files do not seem to exist!
I have been using the excellent H3Viewer to access ArcObjects help. It's as if nothing has been installed even when the installation ran without error. Shouldn't there be a Help folder in the Developerkit folder?