How to import registration number in command line

Dear Sir,

We are installing the MEGAN UE edition in command line. However, we cannot figure out how to import the registration link in command line. There is no clue from the megan manual.

Could you pls tell me how to do it?
Many thanks!

To see all command-line options, run the command line with option -h
The option is listed there:

-rc, --registrationCode [string]     Registration code.