To do this go to your device’s app store and locate the Instagram app. Press the “Uninstall” button then confirm the action to remove the app from your device.
You can use a third-party app store, such as APKPure, to download an older version of Instagram. Please search for the version you want to install, then download and install it on your device.
Click on the link below to get full details on how to safely downgrade your Instagram an all devices.