have to uninstall kaspersky internet security, but do not have the computer

[A Crab]

Have Kaspersky Internet installed on three computers.  One computer was returned to the vendor but  I did not uninstall the software.  I bought a another computer and want to install the the Internet Security software on it.

How do I get authorization to install the software on the new computer?

In My Kaspersky, four computers are listed.  How do I identify the computer that was returned to the vendor?

[Flood and Flood's wife]

Hello @A Crab 
Welcome!

• For the device that's been returned to the vendor, is it possible to contact them & ask for the device name? 
• Apart from the device that's been returned to the vendor, what (do you think) the 4th device might be? Is it the new computer? IF "yes", disconnect it atm. 
• In the MyKaspersky account, the devices show "Last connection date & time", from that information are you able to assess which device is the one that has been returned to the vendor? 
• In the MyKaspersky account Devices tab, take screen prints of all devices & the screens associated with each device. 
• Using Windows, name the 2 existing devices with names that mean something to you. 
• In MyKaspersky, select Disconnect for all 4 devices. 
• Synchronise the two newly named devices, with MyKaspersky account; they should be reflected in the account with the new names. 

Thank you🙏

Flood🐳+🐋