Thanks for contacting us. The simple answer is yes! For instructions on how to download ActivInspire, please go to http://www.PrometheanKB.com and search for article 10416. Each licence key that you have at school is allowed to be used twice, once for the main machine to be used with the Promethean hardware and once for use on a home PC for preparatory work.
I hope this answers your questions and if you need any further assistance please do not hesitate to get in touch.