How to install Photoshop Elements 2020 High Sierra

Hi! My Mac is late 2012 (High Sierra 10.13.6) so Elements 2021 does not work. I got the trial version of 2020 from Adobe, which works just fine. When I want to purchase it, it shows me in the checkout box Adobe Photoshop Elements 2021! I do want the 2020 and not the 2021... How to? 

Please does anyone have a solution for me???? 

Thanks!