A QlikView Partner or Qlik themselves can arrange a time limited trial version so a demonstration application can be tested and evaluated. Often this can also involve a QlikView consultant developing a demonstration application so that you are able to fully appreciate the power and flexibility available to your users through QlikView.
You should contact the sales team at Qlik or a Qlik Partner.
You can get a list of partners here http://www.qlik.com/uk/partners/find-a-partner
