I need to update and install the software
iPhone 6, iOS 12
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It sounds like you have an iPhone 6 or iPhone 6 Plus which is limited to iOS 12.5.7. It cannot install any higher operating system.
Do you have an iPhone 6? Not sure?
Settings > General > About > Model Name
If you do have an iPhone 6, it is time to look for a new iPhone that will allow you to install higher iOS versions so you can use the apps that you want.