Does not install on 2nd computer

I just extended my license and upgraded for 3 computers. I just installed it on my wife's computer and put in the new license # but it does not accept it. Please advise. Thank you kindly. Kaveh Zamani

Do any of the things mentioned here help?

https://support.piriform.com/hc/en-us/articles/204043844--Problems-activating-or-registering-CCleaner-Professional