All iOS/iPadOS Apps are off-shelf and unavailable after April 2024.
Android version of Beautiful Paper are still available. Download at https://pixeldrain.com/u/DTTkmcZT (VPN needed)
(methods are not working for many journals. Update is coming.)
AirPDF is a pdf reader on MacOS, available to install as .dmg file at https://pixeldrain.com/u/qkTgSyfA