Hi!

You want Windows activator?

Open ‘cmd’ as Administrator and use the following command (replace KEYHERE with the key in the activation keys page from Microsoft):
slmgr.vbs -upk
slmgr.vbs -ipk KEYHERE
slmgr.vbs -skms kms.0300.nl
slmgr.vbs -ato

Keys?
https://docs.microsoft.com/en-us/windows-server/get-started/kms-client-activation-keys

What about Office activator?

Open ‘cmd’ as Administrator and use the following command (replace KEYHERE with the key in the activation keys page from Microsoft):

Office 32-bit
cd \Program Files (x86)\Microsoft Office\Office16
cscript ospp.vbs /sethst:kms.0300.nl
cscript ospp.vbs /inpkey:KEYHERE
cscript ospp.vbs /act
cscript ospp.vbs /dstatusall

Office 64-bit
cd \Program Files\Microsoft Office\Office16
cscript ospp.vbs /sethst:kms.0300.nl
cscript ospp.vbs /inpkey:KEYHERE
cscript ospp.vbs /act
cscript ospp.vbs /dstatusall

ATTENTION: You need a Volume License edition of Office. Either find one or convert it.

Office 2016/2019 keys: https://docs.microsoft.com/en-us/DeployOffice/vlactivation/gvlks?redirectedfrom=MSDN