Encrypted Magic Folders 05.01.1 How Do I Encrypt My Wireless Network?

How do I encrypt my wireless network? - encrypted magic folders 05.01.1

I have a D-Link router and it came with a free trial version of Network Magic. There was no protection in the wireless encrypted network, and was able to block.
But once the process finished, encryption and locking of the network, not active, and the only way to ensure that the network is to buy Network Magic.

Of course, I do not think you can buy it immediately, and I'm doing on the search for alternatives, the same work.
Therefore, there is still the network without having to buy the program or to obtain the free program back up to?