Hi Chan,
If you are using Econa on Joomla 5, you are using the Econa v2.x series, which follows Joomla’s core method for handling updates.
To enter your download key, navigate to “System” → “Update Sites”, then locate and click on the update site for Econa. You will find a form where you can enter your download key.
Regarding Econa, it is not a standalone component, which is why you don’t see it under “Components.” Instead, Econa consists of multiple plugins that enhance image handling in Joomla. Its main purpose is to provide image editing and automatic image uploads. You can create a custom field of type Econa to allow users to upload images, and it also offers features to enhance Joomla’s core article images.
You can learn more about Econa here:
https://www.firecoders.com/joomla-extensions/econa
Let me know if you have any further questions!
Best regards