After thinking hard and discussing the matter with our partners worldwide, we’ve ended up with changing AggreGate SCADA/HMI licensing policy. From now on it doesn’t matter how many devices you have. AggreGate SCADA is now licensed by tags (which are sometimes called I/O channels). The price is given per one AggreGate server depending on tag count.
Are you using a free 3 devices version of SCADA? It is now available as a free version for 100 tags on download page.