Kindly delete the folders below and then activate the license.
MAC
HD\Library\Application Support\Avid\Licenses
HD\Library\Application Support\Avid\SWL
HD\Library\Application Support\Avid\Pixie (skip, if not available )
Win 7
C:\ProgramData\Avid\Licenses
C:\ProgramData\Avid\SWL
C:\ProgramData\Avid\Pixie or C:\ProgramData\Pinnacle\Pixie (skip, if not available)