The issue you're experiencing with invisible images in the Spine Trial version is not a restriction of the trial itself. The Spine Trial is designed to have all the features of Spine Professional, including the ability to display images. There are several potential reasons why images might not be showing up in your projects:
Missing or Incorrect Paths: Ensure that the images are correctly located in the path specified within your Spine project. If the images have been moved or if the project is looking for them in a different directory, they won't display.
Compatibility Issues: If your projects were created with an older version of Spine, there might be compatibility issues with the current version of the Spine Trial. Try checking if there's an update or a specific setting that needs adjustment for older projects.
Graphics Hardware or Software Issues: Rarely, the issue might be related to your computer's graphics hardware or software settings. Ensure your graphics drivers are up to date.
Since the trial version is intended to showcase all the capabilities of Spine, including image display, the problem likely lies elsewhere. It's not a limitation of the trial version to hide images or restrict their display.