MC542 - Configuration of Quartus II 3.0

Create a file called license.dat and place content similar to the one below that you should have received by email when registering your program:
FEATURE quartus_lite changed 2004.02 21-feb-2004 uncounted \ 0215942E52C7 HOSTID = DISK_SERIAL_NUM = 2c3310a5 SIGN = "13B9 F429 \ 738F 3DFA A1ED 8293 CB03 7807 3797 0440 FC54 3102 3017 7A80 \ 9E6F 167 148 1 36 9 80 7 88 6563 1 1C8815 3A81F 2336F12 " 
Save the file and in Quartus, go to the "Tools / License Setup" menu. Where "License file" is written, enter the full path to the license.dat file and click OK.