The thing is that you are using an old version of Adaxes while the instructions you are referencing are only for the latest version. To activate your license key:
- Unzip the license.zip archive.
- Navigate to the folder where Adaxes Service is installed, which is C:\Program Files\Softerra\Adaxes 3\Service by default.
- Open the License folder.
- Copy your license key file (license.admlic) to the folder.
- Restart Adaxes service.
If you have multiple instances of Adaxes service sharing common configuration, activate your license key for each instance.