Unfortunately, the Mac Pro 5,1 is not one of the Catalina Compatible Macs being officially supported. And though I cannot exactly recommend it, there just might be some hacks out there for you. Perhaps someone else will point you in the right direction. Two weeks after releasing the macOS Catalina 10.15.4 update to its traditional computers, Apple has released the macOS Catalina 10.15.4 supplemental update. The new software update can now be downloaded and installed from the Mac App Store for free.

Mac Pro 5 1 Catalina
2011 Macbook Pro Catalina

When you upgrade to macOS Catalina, you get more of everything you love about Mac. Experience dedicated apps for music, TV and podcasts. Smart new features in the apps you use every day. And Sidecar, which lets you use iPad as a second Mac display. Best of all, upgrading is free and easy.

Chances are, your Mac can run macOS Catalina.

Mac computers with Metal-capable graphics processors (GPUs) can upgrade to macOS Catalina.

Make sure you’re ready to upgrade.

Before you upgrade, we recommend that you back up your Mac. Then, if your Mac is running OS X Mavericks 10.9 or later, you can upgrade directly to macOS Catalina.

Upgrading is free. And easier than you think.

Upgrading from macOS Mojave?

Go to Software Update in System Preferences to find the macOS Catalina upgrade. Click Upgrade Now and follow the onscreen instructions to begin your upgrade. If you don’t have broadband access, you can upgrade your Mac at any Apple Store.

Upgrading from an older version of macOS?

If you're running High Sierra (10.13), Sierra (10.12) or El Capitan (10.11), upgrade to macOS Catalina from the App Store. If you’re running Lion (10.7) or Mountain Lion (10.8), you will need to upgrade to El Capitan (10.11) first. If you don’t have broadband access, you can upgrade your Mac at any Apple Store.

OS X 10.9 or later
4GB of memory
12.5GB of available storage (OS X El Capitan 10.11.5 or later)*

Some features require an Apple ID; terms apply.
Some features require a compatible internet service provider; fees may apply.

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 Catalina:

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 (2017)
Mac Pro (Late 2013 or newer)

Siri

Requires a broadband internet connection and microphone (built-in or external).

Hey Siri

Supported by the following Mac models:

MacBook Pro (2018 or newer)
MacBook Air (2018 or newer)
iMac Pro

Dictation, Voice Control and Voice Memos

Requires a microphone (built-in or external).

Spotlight Suggestions

Requires a broadband internet connection.

Gestures

Requires a Multi-Touch trackpad, Force Touch trackpad, Magic Trackpad or Magic Mouse.

Force Touch gestures require a Force Touch trackpad.

VoiceOver gestures require a Multi-Touch trackpad, Force Touch trackpad or Magic Trackpad.

Photo Booth

Requires a FaceTime or iSight camera (built-in or external), or USB video class (UVC) camera.

FaceTime

Audio calls require a microphone (built-in or external) and broadband internet connection.

Video calls require a built-in FaceTime camera, an iSight camera (built-in or external) or a USB video class (UVC) camera; and broadband internet connection.

Apple TV

High Dynamic Range (HDR) video playback is supported by the following Mac models:

MacBook Pro (2018 or newer)
iMac Pro (2017)
Mac Pro (2019) with Pro Display XDR

Dolby Atmos soundtrack playback is supported by the following Mac models:

MacBook Air (2018 or newer)
MacBook Pro (2018 or newer)

Sidecar

Supported by the following Mac models:

MacBook (2016 or newer)
MacBook Air (2018 or newer)
MacBook Pro (2016 or newer)
Mac mini (2018 or newer)
iMac (late 2015 or newer)
iMac Pro (2017 or newer)
Mac Pro (2019)

Supported by all iPad models with Apple Pencil support:

12.9-inch iPad Pro
11-inch iPad Pro
10.5-inch iPad Pro
9.7-inch iPad Pro
iPad (6th generation or later)
iPad mini (5th generation)
iPad Air (3rd generation)

Continuity Camera

Requires an iPhone or iPad with a Lightning connector and iOS 12 or later.

Continuity Sketch and Continuity Markup

Requires an iPhone with iOS 13 or iPad with iPadOS.

Handoff

Requires an iPhone or iPad with a Lightning connector and iOS 8 or later.

Instant Hotspot

Requires an iPhone or iPad with cellular connectivity, a Lightning connector and iOS 8.1 or later. Requires Personal Hotspot service through your network provider.

Universal Clipboard

Requires an iPhone or iPad with a Lightning connector and iOS 10 or later.

Auto Unlock

Supported by Mac models introduced in mid 2013 or later.

Requires an Apple Watch with watchOS 3 or later or an iPhone 5 or later.

Approve with Apple Watch

Supported by Mac models introduced in mid 2013 or later.

Requires an Apple Watch with watchOS 6 or later or an iPhone 6s or later with iOS 13.

Apple Pay on the Web

Requires MacBook Pro with Touch Bar, iPhone 6 or later with iOS 10 or later, or an Apple Watch with watchOS 3 or later.

Phone Calling

Requires an iPhone with iOS 8 or later and an activated data plan.

SMS

Requires an iPhone with iOS 8.1 or later and an activated data plan.

Home

Requires an iPhone with iOS 12 or later and a configured Home app.

AirDrop

AirDrop to iOS and iPadOS devices requires an iPhone or iPad with a Lightning connector and iOS 7 or later.

AirPlay

AirPlay Mirroring requires an Apple TV (2nd generation or later).

AirPlay for web video requires an Apple TV (2nd generation or later).

Peer-to-peer AirPlay requires a Mac (2012 or later) and an Apple TV (3rd generation rev A, model A1469 or later) with Apple TV software 7.0 or later.

Time Machine

Requires an external storage device (sold separately).

Power Nap

Supported by the following Mac models:

MacBook (Early 2015 or newer)
MacBook Air (Mid 2012 or newer)
MacBook Pro with Retina display (Mid 2012 or newer)
Mac mini (Late 2012 or newer)
iMac (Late 2012 or newer)
iMac Pro (2017)
Mac Pro (Late 2013 or newer)

Boot Camp

Allows Boot Camp installations of Windows 10 on supported Mac models.

Exchange Support

Requires Microsoft Office 365, Exchange 2016, Exchange 2013 or Exchange Server 2010. Installing the latest Service Packs is recommended.

Windows Migration

Supports OS X 10.7 or later and Windows 7 or later.

App Store

Available only to persons aged 13 or older in the US and many other countries and regions.

App Store
Apple Books
Apple News
Automator
Calculator
Calendar
Chess
Contacts
Dashboard
Dictionary
DVD Player
FaceTime
Find My
Font Book
Home
Image Capture
Launchpad
Mail
Maps

Messages
Mission Control
Music
Notes
Photo Booth
Photos
Podcasts
Preview
QuickTime Player
Reminders
Safari
Siri
Stickies
Stocks
System Preferences
TextEdit
Time Machine
TV
Voice Memos

Activity Monitor
AirPort Utility
Audio MIDI Setup
Bluetooth File Exchange
Boot Camp Assistant
ColorSync Utility
Console
Digital Colour Meter
Disk Utility

Grapher
Keychain Access
Migration Assistant
Screenshot
Screen Time
Script Editor
Sidecar
System Information
Terminal
VoiceOver Utility

Mac Pro 5.1 Catalina Hack