Avira has released Avira Free Mac Security 2.0.4, an update to its free anti-virus tool for Macs. Version 2.0.4 boasts a user interface redesign as well as performance improvements and tweaks to the Scheduled Update and Scheduled Scan tools.

The update also adds support for scanning network shares and squashes a number of bugs that plagued earlier versions.

The most significant change in Update 4 is the redesign of the main user interface – this is to tie in the product more closely with Avira’s new corporate design. It’s accompanied by a number of minor, unspecified GUI improvements.

Avira Free Mac Security 2.0.4 offers free protection against viruses for OS X users.

The Scheduled Update and Scheduled Scan tools have been tweaked to remove what Avira terms “unnecessary” windows, while there are unspecified performance improvements to the scanning engine, which now also supports network shares.

A number of issues have also been resolved with this new release, including general problems with socket files, as well as a number of fixes for the onaccess protection module, including one that failed to quarantine files on MBA.

The update is the fourth since version 2.0 was released last September. Version 2 introduced a new Advanced Quick Scan feature that can dynamically scan different parts of the system according to the latest guidance from the Avira virus labs. It also combined the update procedure for both program and virus definitions to ensure users are using the latest version of the product.

Avira Free Mac Security 2.0.4 is available now as a freeware download for Macs running OS X 10.8 (Mountain Lion) or later.