Thanks for considering Aspose.
Aspose for Java is a collection of file format APIs for Java developers used to create, edit, render, print and convert between a wide range of popular document formats from within any Java J2SE, J2EE applications or other applications. The Java APIs are written in pure Java and compiled in JAR files for distributions.
The Download version is same for all Java libraries. By default, it will work in evaluation mode. But once you purchase it, you will get license (file) to work with the product with full capacity. The evaluation version will become professional when setting the license in your code, see the documents for your reference:
Applying a License to Aspose.PDF
Generally you can expect 12 official releases for Java APIs mostly. We normally publish new release of the API in each month.
Yes, this is equally important. There is no limit for hot fixes and other security updates for the APIs. Our users post issues or demand for enhancements and we can provide them with hot-fixes or interim releases so they do not have to wait for the newer releases.
To manage issues or enhancements, we have our issue tracking system. Each enhancement or issue is logged to our tracking system. For example, if a user finds any issue, he reports us in the forums with details, sample files and code, we evaluate the issue and log it (if found) to our database for correction. Once the issue is resolved, we notify clients and share the Download link to the fixed version.
Furthermore, if you find any confusion (to accomplish a task) or do not know how an API works, we provide him help with sample code or demos to understand the feature.
Hope, this helps a bit.