1. Office 2016 64-bit version: This indicates you're working with the 64-bit architecture of Office 2016.
2. ISO file: The .iso file extension suggests you're using or plan to use an ISO image for installation.
3. C2R (Click-to-Run): This is a technology from Microsoft that allows for faster installation of Office by streaming the installation from Microsoft's servers.

: A search box at the top of apps (Word, Excel, PowerPoint) that lets you type what you want to do and takes you directly to the command. Smart Lookup

. While it will still function, you will no longer receive security updates.

tags often appear when a background update or previous installation is stuck.

"Something went wrong" messages during the initial ISO mount or installation. 2. The Primary Fix: Online Repair

Under Update Options, select Disable Updates, then Enable Updates again to force a refresh. Click Update Now to attempt the installation manually.  3. Reset Configuration Files 

Click Change, then choose Online Repair (this is more thorough than Quick Repair).  2. Clear Stuck Background Updates 

: This is a common fix for volume-licensed versions of Office 2016 to reset the activation timer. Navigate to: C:\Program Files\Microsoft Office\Office16 OSPPREARM.EXE , right-click it, and select Run as Administrator Quick or Online Repair