Update MacPro 2010

Hello, Lovemonty.

Please verify that your Mac is of a vintage that is supported for upgrade.

Mac Hardware Requirements for High Sierra

For details about your Mac model, click the Apple  icon at the top left of your screen and choose About This Mac.

These Mac models are compatible with macOS High Sierra:

• MacBook (Late 2009 or newer)

• MacBook Pro (Mid 2010 or newer)

• MacBook Air (Late 2010 or newer)

• Mac mini (Mid 2010 or newer)

• iMac (Late 2009 or newer)

• Mac Pro (Mid 2010 or newer) <-- Are you sure?

EDIT - What happens when you try to upgrade?