I have done this migration several times with previous iPhones with no issues, but this time seems a little different. As per typical procedure, I have backed up my old iPhone (6 Plus, iOS 10.0.1) to iTunes, and restored this backup to the new iPhone (7 Plus, iOS 10.0.1). Strangely, not all apps went over to the new iPhone after iTunes was done syncing. I noticed that some of the apps on iTunes have an exclamation mark next to them. When selecting "Show in Finder", the apps are nowhere to be found. Hence, I connected the old iPhone and attempted "Transfer Purchases from [old iPhone]" in order to transfer those affected apps. No luck. I even tried deleting a few of the unimportant ones with exclamation marks and attempted the "Transfer Purchases" method again. Still no luck. Any advice?