When your order is complete and you have received the order confirmation email, you can login to your GoMage account and download the LightCheckout extension package under the Downloadable Products section.
Step 1. Upload Files
Unzip the package and upload all extension files into /app/code/GoMage folder in the root directory of your Magento 2 project. You may use either FTP or SSH connection to do that. If there is no /code or /GoMage folder on the server yet, you should create those folders.
Step 2. Install the Extension
Access your server by SSH, go to Magento 2 root folder and run the following command:
php bin/magento setup:upgrade
Step 3. Clear cache
Go to System → Cache Management and clear the store cache.
Step 4. Use Extension
Go to Stores → Configuration. You will see a new tab named GOMAGE in the left column.
Screenshot: Stores Configuration
At this point, you need to activate the extension.
GoMage LightCheckout extension for Magento 2 does not need an activation key. We have developed a new activation system that is implemented in LightCheckout and will be also implemented in the next releases of other GoMage extensions for Magento 2. Follow the link above to learn more about our new Activation 2.0.