Hi,
[quote]I use XDS100v2 USB Emulator on TMS570MDK.[/quote]
As you're using XDS100v2, you can instead use this option for license:
Go to: Help -> CCS Licensing Information -> Upgrade -> Launch License Setup
For more info check: http://processors.wiki.ti.com/index.php/Licensing_-_CCS
Regards,
Gautam