In our FAQ we have explained that our downloads are given from port 8080 instead of port 80. So, the simpliest way to know if your port 8080 is blocked by your firewall is to try to download something from Simviation.com, why ? Because simviation use the same port for their downloads, so if it doesn't work with simviation and Rikoooo then it's 100% sure, your firewall block the port 8080. You must open the port 8080 TCP/UDP by adding a rule into your firewall.
Then every download will work on our website and even at many other websites.