iPod touch (4th Gen) App Store

Hi,

I have an iPod touch 4th Generation & a 3rd Generation also.

I got them charged but I am having trouble installing certain apps.

When I install some apps, it lets me download an older version if I download it from my purchased menu.

But when I try to download some apps (Mainly by Apple and Google) it tells me "This app is incompatible with this iPhone". It confuses me because I have downloaded these apps the same iPod a few years ago. But now they do not download. Is there a workaround or a fix?

I tried to see if it worked on my iPod 3rd gen, but it doesn't even load the purchased list/page.

Any help is helpful :)