On ALEKS' Download web page, it requires a "plug-in" for the school setting. (Although there is also the "streaming" plug-in for use in public library etc., it is not recommended.)
FWIW, I interpret that as meaning simply that if you had a lot of people on the network using the streaming plugin simultaneously, your network might get overloaded. IOW, I think the only issue is that the streaming plugin causes more network traffic than the usual one (because, I assume, more of the computation of what should be displayed is done on their server, and then the results sent over the network to you, compared with the usual plugin which sends less material and relies on the plugin on the local machine to calculate what should be displayed from it). Of course what matters is not what you or I think but what the person in charge of your school's IT thinks, but I wouldn't write this off.
