In order for you to be able to activate the Heimdal Enterprise version on a revoked machine you will need to follow the below steps:
1. Log in to your Heimdal Dashboard https://dashboard.heimdalsecurity.com/
2. From the left menu select Management > Active clients
3. In the Active Clients select the Revoked view
4. Once you have selected the Revoked view search for the hostname that you want to unrevoke, select it, and from the drop-down menu select Unrevoked and press Apply.
*Note: if you don't find the hostname that you want to unrevoke, please change the timeframe and select a different start date. The start date needs to match the day the hostname was initially revoked.
5. Once these steps have been completed, you can return to the hostname and restart the activation process.