Is this forum visible to other users? Can they see the license number you pasted above?
Also, I would recommend making it clear on that page that that number is the license number.
When I enter the number you mentioned I get this error message:
Error
This license is invalid. Please contact us for more information!
For some case of server you cant install the jomsocial via iJoomla installer.. (we are working on this right now)
For time being please you install the Jomsocial package (jomsocial zip file) directly, if you dont know how to do it, please create new topic, and I will install it for you.