I'm currently configured the Prolinx unit, and had noticed that in the manual some info about a manditory upgrade to version 2.4. My unit was purchased back in 2001, but shows a revision level of 2.01. I entered the address given to receive the upgrade, but the URL showed unable to find it. The URL I used was <www.prolinxgateways.com/upgrade_240>. Any help on how I could get this upgade would be greatly appriciated.