How to Install and Activate Avast Ultimate After completing your purchase, you can activate the product by following these steps: **• Windows** 1. Open Avast Product Downloads on your computer to download Avast Ultimate. 2. Install the downloaded file by following the on-screen instructions. 3. Open the Menu, then select **My Subscriptions**. 4. Choose **Enter Activation Code** to input the key you purchased from Murnistore. 5. Wait for the activation and installation to complete. **• Mac** 1. Open Avast Product Downloads on your computer to download Avast Ultimate. 2. Launch Avast Ultimate and click **"My Licenses"** or **"My Account"**. 3. Sign in to your Avast account or create a new one if you don’t have one yet. 4. Click **"Enter Activation Code"** or **"Enter License"** and input the Avast Ultimate Key you purchased from Murnistore. 5. Click **"Activate"** to enable the product. **• Android** 1. Install Avast Ultimate from the Google Play Store and launch the app. 3. Follow the on-screen instructions to create an Avast account and complete the setup process. 4. After logging in, tap the **"More Options"** button (three dots) in the top-left corner of the screen, then select **"Already purchased?"**. 5. Choose **"Redeem an activation code"**. 6. Enter your Avast Ultimate Key in the text box and tap **"Use this code"** to activate the product. **• iOS** 1. Install Avast Ultimate from the App Store. 2. Launch the app and tap the **"Get Started"** button. 3. Follow the on-screen instructions to create an Avast account and complete the setup process. 4. After logging in, tap the **"Upgrade"** button in the top-left corner of the screen and select **"Already purchased?"**. 5. Enter your Avast Ultimate Key in the text box and tap **"OK"** to activate the product.