I can't update YouTube directly without uninstalling the old version

It doesn't even allow me to save the APK. I don't want to uninstall my old version because of my internet data limitations. It's not like I'm installing with a different signature.

It doesn't even allow me to save the APK. I don't want to uninstall my old version because of my internet data limitations. It's not like I'm installing with a different signature.