Pure noi che abbiamo già la 5.3 dobbiamo aggiornare 
What's new in 5.3.174622.1216?
Below are *some* of the enhancements. The fixes included in the release notes are not the full list of the fixes.
NEW! Full IPv6 Support in firewall
NEW! Rootkit Scanner - Hidden registry keys, files and folders are detected
NEW! 5 skins from Comodo, including a native windows skin
IMPROVED! AV database updating - Virus DB size reduced significantly
IMPROVED! AV engine - fixed some bugs and added new detection mechanisms
IMPROVED! Cloud scanning is enabled by default in manual scanner now
IMPROVED! Installer - It now enables/disables windows firewall/defender during the installation/uninstallation
FIXED! CIS causes massive amount of entries in windows security audit logs
FIXED! AV does not validate the revocation status of the certificates in signed binaries
FIXED! BSOD in cmderd.sys
Whats New in
5.3.175888.1227 ?
FIXED! CIS causes unnecessary DNS queries and update checks
FIXED! AV does not properly validate the revocation status of the SOME certificates
FIXED! AV scanning freezes if rootkit scanning is enabled
FIXED! FW shows too many listening connections