I HAVE A MAC PRO BOOK 2012 HOW CAN I UPDATE TO OS X 10.11

Your device can update to Mac OS catalina. Follow the instructions by EU Rouge to get an installer for older OS versions:

https://discussions.apple.com/thread/253216145?answerId=256014916022#256014916022

You can ignore the other post. It refers to OS Big Sur which is irrelevant.

127Jeni8 Said:

"I HAVE A MAC PRO BOOK 2012 HOW CAN I UPDATE TO OS X 10.11: I NEED TO UPDATE MAC PRO BOOK 2012 OS X 10.10 TO OS X 10.11"

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You Can't.

What you are looking to perform is not an option. This is because its hardware is not proficient enough to run it.

See Here: macOS Big Sur is Compatible with these Computers - Apple Support

Babowa is correct: OS X 10.11 I did not see the "10" in "10.11". Took it as macOS 11

10.11 is El Capitan.

Big Sur is OS 11.