If your employer has a volume license agreement then you may have bought office for your home computer through the Home Use Program (HUP). Sometimes getting the installer can be difficult.

Office 2013, 2016 and Office 365

If you have a genuine product key for Office 2013, 2016 or Office 365 you can recover your key by asking Microsoft's Virtual Agent; basically a chat bot. To get started click the link below:

https://support.microsoft.com/en-us/contact/virtual-agent/?partnerId=office&userInput=I%20need%20to%20download%20office%20using%20my%20product%20key

As you can see from my example below simply enter your genuine product key and the virtual agent will create you a download link.
HUP recovery example

Office 2010:

Even though the chat bot method offers a download link if you use a Office 2010 serial its actually gives you a Office 2013 link for some reason. Instead ask Microsoft Support who will often given you a download link.

Remember both these methods are only for those who bought genuine Microsoft Office through the Home Use Program.