Well you have a couple of choices here. You could :
a) talk to the network administrator and ask him/her to correct it
b) if it's limiting you through their network that your connected to via wifi you could go home and download it.
c) If going home doesn't work it might be because it's still checking with it's home (your work) in order to fix this you must find what IP that home has temporarily block it and hope that it defaults into giving you permission when it can't connect.
d) If your network admin is serious about this stuff it's installed on local and you'll be forced to perform action a.