From FAQ:

Alert System is an indicator that can only be efficiently used, when used in multiple pairs at the same time, to be able to get a good frequency of alerts. Due to the demo’s necessary restriction to 1 pair, it’s not possible to properly test the indicator in that fashion. To see the indicator in action, you can watch VSA videos on our Youtube channel. Also, any purchase is essentially risk-free, since we have a strict 7 days money-back guarantee.