Hi - I believe that Schema Plus is produced by Arch Consulting. Here is a link to the web page on their site for the product:
ARCH Consulting, Schema Plus
The site indicates that you can "Contact us at info@archcons.com or 704-641-0296". They can probably let you know about a trial version or any other ways of accessing the product.
I hope this is helpful, Cal
Cal Domingue
Principal Support Engineer, Global Customer Success
CA Technologies