@Rouxibeau isn't it possible to download the apk? Like on APK mirror or other reputable source on the web? I remember there was also a website that grabbed the apk straight from the Play Store if the app was free.
Or you can use Aurora Store if possible. That's how I got Instagram Lite.
Part of the reputability of APKMirror is that you can verify the integrity of its offerings by comparing their signatures to their counterparts on Google Play. This change removes the ability to do that if you don't already have a known good copy with which to compare.