https://wccftech.com/download-ios-12/

Everyone can now download iOS 12 final for their compatible iPhone, iPad and iPod touch device. We have the direct download links to IPSW files.

The big day has finally arrived and everyone with a compatible iPhone, iPad or iPod touch can download iOS 12 final onto their device. The list of compatible devices is pretty wide, and it’s highly likely that you’re one of the many that has a 64-bit device that supports the new firmware. In case you’re still unsure whether or not your device supports iOS 12, you can check out the list of devices below: