We have identified an issue that blocks the Office Mix Setup program after users upgrade from the 32-bit version of Office 2013 to the 64-bit version of Office 16 Technical Preview:
Root causeWhen Office 2013 is uninstalled, it leaves behind some stale registry keys that Office Mix Setup does not recognize as invalid. As a result, when the Office Mix Setup program is run, it attempts to install Office Mix for a valid 32-bit version of Office 2013 but encounters an error when it tries to evaluate the 32-bit Office program files.
SolutionWe have fixed this issue internally and will make the fix available in our next release of Office Mix.
In the meantime, here is a workaround designed to ignore any stale registry keys leftover from a 32-bit uninstallation of Office and install Office Mix for a 64-bit version of Office:
- Press Windows+R and type "regedit" to open the Registry Editor.
- In the Registry Editor, navigate to this folder, which should be empty:
- Right-click the folder and select Rename.
- Type a new name for the folder (e.g., Uninstalled).