Can't request Trial Key for Legacy Version 10.4?

Hi there. I've recently started a trail on my new Macbook pro to operate a printer that only uses Windows software.
Due to hardware issues, I've needed to move the printer to an older Mac and have installed the 10.4 version of Parallels.
However, I'm getting an error when I request a trail on this version. Is there any way to get a trail key for this version so I can test it?
Thanks

 

Hi Sean8. Trial version is available only for the latest Parallels Desktop version which is version 15 now. If you wish to use the version 15 trial, please refer to this article.