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#21
Sorry, no idea. If you have 1607 installed, and you have a 1607 iso, you should be able to do an in-place upgrade repair install.
Repair Install Windows 10 with an In-place Upgrade Installation Upgrade Tutorials
(But note that does not include the case where your installed OS is earlier than the current released build, which is why you have specifically downloaded one).
Further: if your OS is 32 bits, you need a 32 bit ISO, and one of the same base language.