Current software for Lowrance can be downloaded from: http://www.lowrance.com/software/upgrade/Default.htm
Current software for Eagle receivers can be downloaded from: http://www.eaglegps.com/software/software.htm
A piece of advice: Follow instructions to the letter! If you do everything per instructions and the upgrade program can not establish communication with the receiver; Go to MENU / SYSTEM SETUP / NMEA DGPS CONFIG and make sure that NMEA and DGPS are set to OFF. It solved the problem for a number of users.