I am unable to update my Macbook pro with 10.

Download directly if you meet the tech specs:

https://itunes.apple.com/us/app/macos-catalina/id1466841314?mt=12&l=en-us

https://www.apple.com/macos/catalina/

macOS Catalina - Technical Specifications - Apple Support

https://support.apple.com/kb/SP803?locale=en_US

System requirements macOS 10.15 Catalina

macOS Catalina will run on all Macintosh computers that supported Mojave:

MacBook: Early 2015 or newer

MacBook Air: Mid 2012 or newer

MacBook Pro: Mid 2012 or newer

Mac Mini: Late 2012 or newer

iMac: Late 2012 or newer

iMac Pro

Mac Pro: Late 2013 or newer; Mid 2010 or Mid 2012 if upgraded with a recommended Metal-capable GPU

Ajay61 wrote:

MacBook Pro 13", macOS 10.15

still unable to download update 10.15.4 to MacBook pro.

Combo update macOS 10.15.4 https://support.apple.com/kb/DL2037?locale=en_US