Hello,
Q6 of the document explains the steps.
If you have uploaded the file to an FTP server you should copy it to the router. Please check the options of the command tftp on page 140 here
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c04770148&withFrame
I guess it should be something like
<msr2003> tftp 192.168.0.30 get CN63XXXXXX.ak
Use the dir command (page 155) to check if the file was copied to flash. If the file is there you can activate it with the command mentioned in Q6 replacing the name of the file with your license file name.
[msr2003] license activation-file install flash:/CN33FTY00B2013073016084479426.ak)