Hi,
Someone in your organisation (i.e. the IT procurer who purchased this product for your Uni) should have download rights to the Service Market Place (SMP): www.service.sap.com/swdc
also in the SMP, there is a license key page where that S-user (sap secure login) should officially request a new key, and downloading a temporary key (whilst you wait for the official one) http://service.sap.com/licensekey
Please be aware - we don't ship keys via the public forum. The product you are using is only ever sold as part of an enterprise contract, which includes support and maintenance service levels, and costs ~20 000 per user. Yes, you read that right!
If however, you were enjoying a temporary evaluation key, and that has expired.. then you need to purchase a license.
regards,
H