I have to thank you in return for the discussion because it is a very important one. I am not declining there are any issues with Office. In fact there are numerous threads like this one handling the same or similar issues. I've had the issue myself - that's
why I found to comment it in the first line. In fact for me the solution was to run ALL available and suitable cleaners that Microsoft has in stock for the affected OS, so I've started with the Office 2007, then 2010 then the 2013 / 2016 cleanup tool in the
order of release to get it fixed.
To be honest the ways how computer work or simply refuse to work are so numerous. Basically all that I can repeat is that in some circumstances it might be faster - especially since the appearence of Windows 10 - to reinstall or "refresh" the system instead
of fiddling and searching for solutions for hours.
I find it hard myself to refuse to do that just because I am curious and want to learn what's the issue and how to solve it to appreciate people that found a solution or to find the logical solution myself, regardless if the time invested is really worth
it or not. That said on my rig, Windows 10 is installed in about 5 minutes, which isn't the standard for anyone and which doesn't mean that I would simply throw anything aboard to skip around errors like this nasty Office installation bug.
The major problem since decades is that Microsoft is saving developing time for proper installation gauges - these might indicate more precisively when an installation fails and eventually also why, then they are cutting ressources to code proper error messages
that are additionally well documented in the KBs. Yes of course there are logs but to be honest people simply don't love to browse megabyte sized ascii based logfiles.
Microsoft, however, isn't a lone sample of a developer doing so.
After all, - no offence - if anyone keeps failing to install Office despite having ran all the cleanup tools - I think it's better to start with a clean system instead of bothering with finding possible solutions.
Just yesterday I had one system where the Windows component store was so desperately bugged and destroyed that not even sfc or dism could repair it. There are many dependencies on this component store (WinSxS) also Office and Windows Updates or Store...
if such things are damaged and cannot be repaired with usual tools it might be not worth to spent time on the matter any further.
Just my 2 cents.
p.s. I would also advice anyone to avoid inplace upgrades from an older version to a newer version like from 2007 to 2010 or 2010 to 2013 / 2016 but rather uninstall the old version and install the new one -
eventually run the cleaners before.
The reason is that I had a lot of troubles with the migration of Outlook (non Exchange based) profiles and you would be surprised that Microsoft still does save these in a Windows NT 4.0 branch in the registry :), just in case you need to backup anything.