Nearly two years after its initial launch, Instagram Lite is no longer supported and has vanished from the Google Play store. The app was live in 13 markets and offered the basic utility of the full Instagram app in a much smaller package of just 573 kB (kilobytes), more than 50 times smaller than the full-fledged Instagram app. Some notable omissions in the Lite version were the lack of direct messaging and IGTV videos. Instagram Lite screenshots Users who have the Lite version of Instagram are now prompted to download the official Instagram app. Not all hope is lost...
Source: https://www.gsmarena.com/instagram_lite_no_longer_suppported-news-43152.php
