Eventually, Instagram’s servers will notice you are on an old version. You will start getting a persistent pop-up that says "Please update Instagram to continue using the app." When that happens, you cannot click "Later." You will be locked out until you update—which you can't do on 4.4.2. This usually takes 6-12 months to kick in, but it is inevitable.
While the latest Lite versions officially target Android 8.0+, specific legacy builds like v430.0.0.4.109 v442.0.0.7.106