To activate additional computers (up to 10), you need use a Sophos Home account, as covered in the activation steps. 

Once you have activated your Sophos Home Premium account with your key, follow these steps to protect additional systems: 

1.From your Sophos Home Dashboard, Click on the Add device  button.

2. Choose the appropriate option

3. This downloaded version will be attached to your Sophos Home account, and will benefit from any Premium features enabled on that account. 

4. Repeat this process to protect additional systems. Be sure to download a new installer each time, as they are specific to each computer. 

Why did I receive a message stating  The key is already used appears when I try to activate Premium ?

This happens when trying to use a key that has already been activated. License keys can be activated one time only, and will be linked to the email address used to access the Sophos Home Dashboard when the activation took place.
Since the key is in use by another account, you may need to re-protect the current computer using that other (Premium) account.  

How do I fix this? 

There are 2 options to fix this, please follow the one that applies best to your case: 

Option 1 - [Requires re-installation]
Log in to your existing Premium activated account
Re-protect your computers via that dashboard (See How to reinstall Sophos Home  )
To protect additional computers (up to 10) with your Premium subscription follow the "Activating additional computers with your Premium account" section above. 

Option 2 - If you want to swap the Premium subscription to another Sophos Home account, please contact Sophos Home support for assistance.  

Why did I receive a message stating that the email is already in use?

This message indicates that the email address is already in use with another Sophos Home account.

There are 2 options to address this, follow the one that applies best to your case: 
Option 1 - [Requires re-installation] Log into your existing account , switch it to Premium with your key and re-protect your computers via that dashboard. See How to reinstall Sophos Home

Option 2- Create a new account using a different email address to keep using the current dashboard you are logged in to. Keep in mind you will need to use this new account to protect systems moving forward (See Activating additional computers with your Premium account section). 

Q: How can I obtain a license key?

A: You can purchase a License key by following these steps:
1. Visit the Sophos Home website and click Buy 
OR access the in-product cart  (Windows users only). 
2. Choose the desired plan and follow the steps to purchase a license
3. At the end of the process, you'll be provided with a license key to enter directly to your Sophos Home installation or to your Sophos Home dashboard. Customers choosing to use the In-product cart will have their key auto-applied. 

Q: What does a license key look like?

A: License keys have the format XXXX-XXXX-XXXX-XXXX (they are comprised of 20 characters plus 3 dashes)

Q: Can I save my license key for later? 

A: No, license keys' timer starts at the moment of purchase. Be sure to activate your license as soon as you purchase it, to benefit from the Premium features for the entire duration of the license.
Auto renewal options are covered at the time of purchase - For payment questions, please see: How to change billing and payment information for Sophos Home Premium subscriptions .

Q: Can I extend my current subscription by adding another license key?

A: Yes. Purchase a key, then follow the Activation steps to activate it.
Your subscription will be extended accordingly. 

Q: Can I add a coupon to a license key activated account?

A: No, the coupon option goes away once Premium has been activated. 

Q: I purchased a Premium subscription before license keys came out, do I need to take any action?

A: No, no action is required. Existing subscriptions will continue to work without user intervention, and recurrent purchases will take place automatically. For payment questions, please see: How to change billing and payment information for Sophos Home Premium subscriptions .