How "directer" as Mkuba50's techbench (MSDN) dump links do you want? You also can download the enterprise editions esd's from abbodi1406 pastebin in the ESD Repository, those links are the WU permalinks.
only you know what you have done to your 1511, will updating to 1607 on a clean system work? Of course!. Any tweaks and twists done, no matter how large or small can cause issues during upgrade processes and with the end results. The only real honest answer I can give you is, "on my system.. YES". With your system, you have a 50/50 chance. So that's a crap shoot for you since I have no idea how clean your system truly is.
I did not do any tweaks with my 1511. How to do a update to 1607 without to kick out my activation than? Just insert the 1607 ISO and let them do?
How to do, without to kick the activation from the 1511 and from the MS Office 2016 out? Just insert the 1607 ISO and let them do?