The Virus Chest in Avast Security for Mac is an isolated space where you can safely store potentially dangerous files before applying further actions. Just renewed avast security, on a mac, safari is telling me it cannot open download, running OS X, 2009 comp, - Answered by a verified Tech Support Specialist We use cookies to give you the best possible experience on our website. Please submit or enjoy content, comments, or questions related to the Mac platform, be it related to the hardware or software that makes it up. Welcome to /r/Mac! We are reddit's community of Mac users, enthusiasts, and experts.