Why can’t I update my iPad Pro to IOS16

Be patient.

Unlike iOS16 for iPhone, released 12th September, iPadOS16 is not due for release until sometime in October. For reasons known only to Apple, release dates for iOS for iPhone and iPadOS for iPad have been deliberately staggered.

However, iPadOS 15.7 was also released 12th September - incorporating essential security updates.

About the security content of iOS 15.7 and iPadOS 15.7 - Apple Support

While iOS16 is available for iPhone, iPhone owners have the option to just install iOS15.7 at this time.

More information about the forthcoming iPadOS16 can be found here:

iPadOS 16 Preview - Apple

When iPadOS16 is released, it will be available for these models of iPad:

• iPad Pro (all models)
• iPad Air (3rd generation and later)
• iPad (5th generation and later)
• iPad mini (5th generation and later)

Because iPad OS 16 has not yet been released. While the iPhone version has been released, the iPad version is scheduled for later this month.

You are very welcome.

iPadOS16 will eventually arrive (most likely as iPadOS 16.1 - in parallel with iOS 16.1 for iPhone later this month).