After registration, you should receive an e-mail with download and installation instructions and a separate e-mail with a license file. In short, you will be given a link to a .exe file that is a single-file installation. You simply run it, and install FEMAP, choose the "Network Client" option during installation. After installation, the license file that gets sent to you is saved in the FEMAP directory (license.dat) and you will be able to run. Please let me know if you do not receive these e-mails within the next 24 hours.
You do not have to re-install, run the batch file "go_network.bat" in the FEMAP directory. Make sure FEMAP is not running when you do this, this will flip the licensing over to Network. I will check on your license file and e-mail you directly.