Many people having issues when installing Microsoft Office they have purchased or downloaded online. The issue occurs when you attempt to install 2016 Microsoft Office and onwards.
Here is the error:
We can fix this by deleting the remaining installation left over from your previous Microsoft Office.
Click the Start Menu in the bottom left hand corner, or press the Windows key on your keyboard.
Now type "run" and hit Enter.
Next type "regedit" and hit Enter.
Now on a new window will pop up called Registry Editor.
On the left panel, click: HKEY_LOCAL_MACHINE
Then click: SOFTWARE
Then look scroll down until you see a Folder named Office or any folder that begins in Office.
Right click and delete each folder.
Done, we have now deleted any traces of your previous Office. Click your original installation file to begin installing office.