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Sep 26, 2016 1:01 PM in response to mpasqu1139by rkaufmann87,I think you mean you downloaded the new Mac OS (IOS is for iPads, iPhones & iPods). If so then restart and do a PRAM reset per the instructions in iMac SMC and PRAM reset.
Then see if your install completes. If it only boots into the version of OS X you had then look in the Applications folder and see if the Sierra installer is still there. If it is, then double click it and your install should work.