Key limit increase or MAK or KMS activation exception To activate your license please enter your Activation Code (s), enter your server's MAC Address or Serial Number and the information below, and then click 'Activate License'. It’s written mostly in Python 3 and has the peculiarity of using multiple GUI toolkits, all using the same core Python code. There are various ways to find this information, depending on how you obtained your software. vbs /unpkey:XXXXX - Where X's are the last 5 digits of the key you're looking to unpair. Volta mac license key Multiple licenses and key already used error? If you try to activate a one-time install of Office for Mac and you get the error: Key already used, you will need to select another license to use.