Windows 10: Install office365, Office key

I can't install office365 without a product key and I can't find my product key. I purchased it online 4 years ago.

:)

 

Microsoft Office 2013 Pro Plus download?

Really I've never experienced that. I have installers on the servers for all office installs and we use them with the key cards to install the related version on customer machines and it works.

 

Office problem with entering key


I have an old pro 2003 Office program disk that I have used on several computers and versions of windows. I had it working on my new computer but had to do a reboot and now when I try to reinstall Office it tells me that I entered the wrong key. I tried the same disk on my laptop with win xp and it worked.
I believe my present problem is because my new computer had Office 365 on it and has expired. I did a complete uninstall of Office365 and also used a program "015ctrremove.diagcab" but still no success in getting it to except the key.
My old 2003 Office did everything I needed so I don't see that I need to pay for a new Office365.
Any suggestion will be appreciated.
PS... I hate win10

 

Is it possible to install Office 2019 on Windows 10 without uninstalling previous versions?

See the Microsoft article<br>
Office installed with Click-to-Run and Windows Installer on same computer isn't supported.

You will need to uninstall both Office 2010 and Office 2016, and buy an Office365
license.

I suggest that if Office 2016 is sufficient, to wait with the move to Office365
until there is an important motivation for it.