Transitions and ratio size in project

I have followed the install instructions supplied with S Transitions 1000+ transitions v6.5 and can call them up from Windows>Extensions in PPro 14.4.0. When adding a transition into the project (cannot drag it onto timeline BTW have to double click) it appears the ratio is wrong so instead of the whole image/s in the 16.9 ratio used blurring in the transition there are ‘borders’ around them (looking at one of the perspective ones I am using) . I have noticed with some tutorials on YouTube that you used to get the different ratio files and you picked the one you wanted for the project, but there was no choice with the one I downloaded. Is there a setting I have missed somewhere? Help!