license upgrade to multi-user

HI 

I bought my Capture One 21 (Nikon) license on 1/3/2021 assuming that it will allow me for multiple installation within my home computers.  I don't use for any commercial purposes, I do use couple of systems (me and my wife) on need basis.  

I realized that I cannot install my license to two different computers, can someone help me what is the process if I have to make my license to multiple computers.

I try calling some USA support number, but could not reach anyone other then the message asking me to get to this forum.

if it needs an upgrade what it is? and how to get it?

appreciate your help.