iMovie/Pages on Mini iPad with iOS 9.3.5

Hi,

I have previusly had iMovie installed on my mini iPad but for spare reasons it was deleted. It still shows up in the app store under purchased items. However, if I try to install now, I get the message that the version of iMovie available only supports iOS 11 and above. That basically means my iPad is not worth much as I cannot upgrade the iOS anymore.

According to various Apple sites, it should be possible to select "download older versions". But I don't get that message when trying to download.

The same is a problem with "Pages". I would appreciate your help as these two apps are required for my kids at school.