Go to https://fileconnect.symantec.com and download the required files. You will need to enter a serial number to get access to the files. As seen to the right.
After you download the files you will have to join them together before you can do a install.
Unix joining instructions:
cat "NB_CLT_7.5.0.4-tar-split.1of3" "NB_CLT_7.5.0.4-tar-split.2of3" "NB_CLT_7.5.0.4-tar-split.3of3" > "NB_CLT_7.5.0.4.tar"
now you are ready to begin the install.