Latest update October 2nd, 2015 2:51 PM
First of all visit to official website of your antivirus from where you can download manual update. For your ease I have listed all links below.
- Avast! – For Pro Antivirus and Internet Security Series 
- Avira – Premium Antivirus and Internet Security 
- AVG – Free version [Link] Internet Security & Premium Security 
- Bitdefender – Antivirus, Internet Security and Total Security 
- Comodo – Anti-Malware Database 
- Kaspersky – Antivirus Updates  Internet Security  Pure Version 
- McAfee – Antivirus Definition Updates 
- Windows Defender – Antivirus Security Updates 
- TrendMicro – Consumer, Enterprise and Mobile 
ALSO READ:Why Should We Update Antivirus
Now after complete download, install it on your pc.
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