Upgrade from High Sierra to Catalina

No, only 2012 and later MacBook Pro. See compatibility section of How to upgrade to macOS Catalina - Apple Support

Depending on which system and mac you could mean by what you wrote,

the next supported macOS could be 10.14.6 Mojave. ~ The mac is too old to

run Catalina. -- Perhaps may not support Mojave either.

{..Your mac pro (tower) would likely require a 'Metal compatible' graphics card..}

If you meant a portable macbook, then no. This Mojave won't run in 2011 model.

Mac Pro introduced in 2013, plus mid-2010 or mid-2012 models

with a recommended Metal-capable graphics card.

"..To find your Mac model, memory, storage space, and macOS version, choose

About This Mac from the Apple menu . ~ If your Mac isn't compatible with

macOS Mojave, the installer will let you know.."

Link to read about and download Mojave 10.14.6 Installer (it then can get the

hours-long wait for system files from Apple servers) here:

• How to upgrade to macOS Mojave (10.14.6) - Apple Support

https://support.apple.com/en-us/HT210190

"If you have hardware or software that isn't compatible with Mojave, you might

be able to install an earlier macOS, such as High Sierra, Sierra, or El Capitan."

Good luck & happy trails!🌞🎣

Good catch -- I read MacPro and thought MacBook Pro; not the first time I've done that/