File Size: 544 MBAvast Premium Security is more than just antivirus. It provides complete online protection for all of your computers, phones, and tablets. The software has custom features for PC, Mac, Android, and iPhone/iPad secure your devices where it's needed most. Single- and Multi-Device options let you choose the protection that works best for you. "Up to 10 devices" means you can share your security with every one of your devices or everyone closest to you.