Unkown sources is checked but cant install apk files

A

AC Question

The new massive version of insta crashes all the time on my phone so i want to revert back to 7.22 from 2016 when it last worked on my phone. I made sure that unkown sources was checked and so i went to apkmirror and downloaded the apk file for 7.22.

I STILL GET CAN NOT PARSE FILE ERROR.

I would like to get this to work

I have an htc inspire from 2011.

Thanks