The closest thing to a trial version for Image Attributes Pro is to try the free version of the plugin available in the WordPress repository.
You can even see the options in Image Attributes Pro by selecting the checkbox to “Preview Pro Features” in the “Basic” settings tab of the free plugin.
Truth About Nulled Versions
If you find a version of Image Attributes Pro on another website offered for free download, it is most likely nulled and unsafe to use. DO NOT INSTALL IT!
Think about it. Someone with enough technical skills had to edit the plugin code to make it bypass the license validation check to make it usable. It can potentially contain malicious code added to the plugin or have simple backdoors that open up your site to hackers.
Why else would someone go through the trouble of doing all the work? By using them you are putting your entire website at risk.
Please consider buying the official copy to receive regular updates and support. You will also be contributing to the further development of the product thus making it better for yourself and everyone else.
If you are tight on budget, please reach out to me and we can figure out something. Please do not put your entire website at risk just to save a few bucks.