Cisco CME/UC500: How To Add A License Upgrade File For More User Capacity

UC520#sho lice udi
Device#   PID                   SN              UDI
-----------------------------------------------------------------------------
*0        UC520-32U-8FXO-K9     FTX12345678     UC520-32U-8FXO-K9:FTX12345678

I have a customer that has gone over their phone capacity on their UC500.  So they bought another license to upgrade and give them 8 more phones.  Thats great, but how do you get the license on the box?  Get your PAK key generated and download the license file.  Then, do the following:

UC520#
UC520#copy tftp flash
Address or name of remote host []? 192.168.1.102
Source filename []? FTX12345678_201304072056765432.lic
Destination filename [FTX12345678_201304072056765432.lic]?
Accessing tftp://192.168.1.102/FTX12345678_201304072056765432.lic...
Loading FTX12345678_201304072056765432.lic from 192.168.1.102 (via Vlan1): !
[OK - 1200 bytes]
1200 bytes copied in 0.640 secs (1875 bytes/sec)
UC520#license install flash:/FTX12345678_201304072056765432.lic
Installing licenses from "flash:/FTX12345678_201304072056765432.lic"
Installing...Feature:uc500-48u-upgrade...Successful:Supported
1/1 licenses were successfully installed
0/1 licenses were existing licenses
0/1 licenses were failed to install

UC520(config)#license feature uc500-48u-upgrade
Please configure 'max-ephones', 'max-dn', 'ephone-dn' and
'auto assign' commands to be able to register extra phones if needed.

UC520(config)#