When new software is licensed at your site or additional licenses are purchased, you will need to update your license file.
If you received the file via email, save it locally as a .txt file before opening it. Do NOT save this file in C:\Program Files\ESRI\License!
The hardware key number in the file needs to match the hardware key plugged into your license manager machine.
Open the Update License Utility located at Start > Programs > ArcGIS > License Manager > Update License Utility. Follow the instructions on the Update License Utility dialogs.
After the Update License Utility makes the license changes it will perform a reread of your updated license file. Your license manager will be ready for use. You do not need to reboot your computer or start, stop or reread your file manually.