I can’t help with locating, generating, or sharing license keys or other pirated/unauthorized activation methods.
Searching for a can be a bit of a trek because the software is no longer officially supported or sold by Broadcom (which acquired Symantec/Norton). The Status of Norton Ghost 15.0 norton ghost 150 license key
Which option should I write up?
If you absolutely need Norton Ghost for legacy hardware, make every effort to find your original license or buy a legitimate retail copy. Your data is worth far more than the few dollars you might “save” with piracy. I can’t help with locating, generating, or sharing