This is critical. If you double-click the Hosts file, you cannot save it.
Even after you enter a valid serial number, Corel Draw X7 attempts to verify that key online. If it detects a mismatch, a blacklisted key, or a previously used key, the software reverts to "Trial Mode" or displays the dreaded "Activation Required" pop-up. Corel Draw X7 Block Activation Hosts File
The Hosts file is a plain text operating system file that maps hostnames to IP addresses. Before your computer queries a DNS server, it checks the Hosts file. If an entry exists, your computer follows that instruction immediately. This is critical