To activate (likely version 9 or 10, often mistyped as "96"), you must follow the official licensing procedure established by its developer, Linial Soft .
Do not pay for a code: Any website selling a "generator" for QuickMobel 96 is a scam.
Antivirus flags: If you find a "keygen" or "patch," your antivirus will likely flag it as a risk (HackTool). In this specific context of recovering your own 1996 software, this is a false positive, but only run it in an isolated environment (like an old offline PC or a virtual machine).