Here's how to install Avast Ultimate (Multi-Device)
Includes Premium Security, Cleanup Premium, SecureLine VPN, and AntiTrack as a bundle for up to 10 devices.
2. Once the download is finished, open the 
avast_security_online.dmg file (by default, downloaded files are saved to your Downloads folder).
3. Double-click Install Avast Security and follow the on-screen instructions to complete the installation process.
Note: If prompted, click Open system preferences to allow required permissions.
4. In your Applications folder, double-click the 
Avast Security icon to open the application, then go to ☰ Menu and select Activate paid features.
5. Type the activation code you received with the product into the text box, and click Activate (if asked, enter your name, email, and postal code).
See detailed installation instructions
6. When prompted, select See my apps (if you selected Not now, go to ☰ Menu and select My Subscriptions).
7. On the list under Subscriptions on this Mac, click Install next to each product for the recently activated subscription and wait until the installation is complete (if asked for system permissions, enter your Mac account credentials to continue).
