This sounds like a network issue. When the install asks you for network info what did you enter in? What IP did FreePBX get assigned? Do you have access to the Internet from the FreePBX box?
Hello,
I had the same problem on some of my installation. On some, I even was not able to finish installation. I believe the problem is somewhere within the load balancing(DNS??) mechanism of freepbx distro’s download servers or my ISP is blocking one of the download servers.