We've made a lot of improvements since the initial 4.0 release that we want to bundle in a new 4.5 release now.
What's new in a-squared Anti-Malware 4.5?
We have significantly improved the surf protection usability. Users told us that there are too many annoying popups, but the alerted hosts are really suspicious. So we extended the popup box with 3 more small buttons. The first one allows you to block a specific host permanently with one click. No need to go manually to the settings anymore and add a new block rule for a host. Others told us that a-squared has blocked a host that they need (e.g. specific advertising redirect hosts). That's why we have added another button to permanently allow a specific host with one click. The third button allows you to access the surf protection settings quickly. Additionally, the small host blocker popups that hide after 20 seconds got a transparend fade out that indicates that it will hide automatically. When you move your mouse over the half transparend window, it switches to no transparency until you move out of the window again.
a-squared Anti-Malware 4.5 has got some additional false alert filter layers. Signed files from trusted software vendors are no longer alerted by the behavior blocker (Malware-IDS). Combined with the community based alert reduction and whitelists, a-squared Anti-Malware is extremely silent compared with previous versions. But real malware is still detected on a very high quality level.
Windows Security Center integration. Windows XP and Vista now recognize a-squared Anti-Malware as a full antivirus software.
Fine tuning & bugfixes: In general we've made tons of little improvements and fixes. Just to mention a few examples of bugs that some users reported in the past: Scanner stops and crashes have been fixed, script files and others are scanned on execution now, etc.