Dosdude1 has released a new version of the macOS Catalina Patcher. The macOS Catalina Patcher enable support for macOS Catalina on older unsupported hardware.

Requirements:

Early-2008 or newer Mac Pro, iMac, or MacBook Pro:
MacPro3,1
MacPro4,1
MacPro5,1
iMac8,1
iMac9,1
iMac10,x
iMac11,x (systems with AMD Radeon HD 5xxx and 6xxx series GPUs will be almost unusable when running Catalina.)
iMac12,x (systems with AMD Radeon HD 5xxx and 6xxx series GPUs will be almost unusable when running Catalina.)
MacBookPro4,1
MacBookPro5,x
MacBookPro6,x
MacBookPro7,x
MacBookPro8,x

Late-2008 or newer MacBook Air or Aluminum Unibody MacBook:
MacBookAir2,1
MacBookAir3,x
MacBookAir4,x
MacBook5,1

Early-2009 or newer Mac Mini or white MacBook:
Macmini3,1
Macmini4,1
Macmini5,x (systems with AMD Radeon HD 6xxx series GPUs will be almost unusable when running Catalina.)
MacBook5,2
MacBook6,1
MacBook7,1

Early-2008 or newer Xserve:
Xserve2,1
Xserve3,1


Machines that ARE NOT supported:

2006-2007 Mac Pros, iMacs, MacBook Pros, and Mac Minis:
MacPro1,1
MacPro2,1
iMac4,1
iMac5,x
iMac6,1
iMac7,1
MacBookPro1,1
MacBookPro2,1
MacBookPro3,1
Macmini1,1
Macmini2,1

— The 2007 iMac 7,1 is compatible if the CPU is upgraded to a Penryn-based Core 2 Duo, such as a T9300.

2006-2008 MacBooks:
MacBook1,1
MacBook2,1
MacBook3,1
MacBook4,1

2008 MacBook Air (MacBookAir 1,1)

Changelog:

1.0b11 - 7/16/2019

Updated to add support for Catalina Developer Preview 4/Public Beta 3

  macOS Catalina Patcher 1.0b11 released