"This application requires iOS 13.4 or later"

Hi sithum256,

Thank you for using the Apple Support Communities. You’ve posted a question in the English Community. If you are able to repost your question in English, you may reach a larger audience and have a better chance of receiving a reply.

Thanks!

Before you go ahead and buy a new iPhone, I would like to tell you that there is a workaround to this issue. The workaround is to purchase it on a newer device so it will be saved to the purchased section in your Apple ID, after which you can go ahead and install it on the iPhone with the older iOS version, such as iOS 12.5.7. It will allow you to install the latest compatible version instead.