The good news is that is famous for its robust Free Version . You don’t actually need a serial number to get high-level protection. What you get for free:

If you truly want the extra features—like the ad-blocker, disk organizer, or driver updater—the safest route is to purchase a legitimate license. It’s often priced very affordably (frequently under $20/year), which is a small price to pay to avoid the malware risks associated with "cracked" software. Stay Up to Date

Version 10.2.0.1251 is an older build. Using outdated software leaves you vulnerable to exploits that have been patched in newer versions. Always download the latest client directly from the official 360 Total Security website to ensure you have the most recent defenses.

It utilizes the 360 Cloud Scan Engine, System Repair Engine, and QVMII AI Engine.