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Released July 15th, 2020.
Build 19G73.
 
This is most probably the last major update for Catalina with only Supplemental Updates or Security Updates to follow. Safe to install on our Hacks without specific issues or surprises to expect. Blessing issue remains for those of us who experience it since 10.15.5 and this requires a reset of NVRAM to avoid. Failing that, 10.16.5 still installs Ok but the temp update partition remains until the macOS Install Data folder located in /System/Volumes/Data is manually deleted.
 

 

 

 
Security updates 2020-004 for High Sierra (17G14019) and Mojave (18G6020) released at the same time.
 

A few of us with old C2D/C2Q platforms (mostly desktop) experienced CMOS reset since updating to 10.15.4.
 
During troubleshooting, the issue was pinpointed to 10.15.4's new boot.efi file (located in /S/L/CoreServices) which, as many of us noticed, was displaying some new info when booting in verbose mode.
 
Initially, replacing 10.15.4's boot.efi file with that of an earlier Catalina release or even an earlier macOS version was found to get rid of the problem without adverse affect on booting Catalina 10.15.4. However, this only worked for Hackintosh systems running Clover, not for systems running OpenCore.
10.15.3_boot.efi.zip
File ownership needs to be re-adjusted to root:wheel upon replacement:
sudo chown 0:0 /S*/L*/CoreServices/boot.efi  
Following further troubleshooting with vit9696, telepati and a few others, vit9696 worked out a temporary workaround for OpenCore in the form of a 5-bytes NVRAM variable wake-failure set to 00 00 00 00 00. All details and explanations are available here.
 
For Clover users, this workaround alternative to replacing boot.efi can implemented as follows in Terminal:
sudo nvram wake-failure=%00%00%00%00%00 Of course, this needs NVRAM to be working properly on the target Hack. For Hacks with no natively-supported NVRAM, it is required to install EMUVariableUEFI.efi Clover module + RC scripts on the Catalina boot volume. Once the variable is set and the system rebooted to take it into account, no more CMOS reset on rebooting from 10.15.4.
 

Bronxteck recently reminded us of links Apple publish in relation to creating bootable installers for OS X and macOS from El Capitan 10.11, so here's a link to the related main page:
https://support.apple.com/en-us/HT201372
 
Very useful as a replacement to the old AppStore method that allowed registered users to re-download an OS X/macOS installation package if they had already done so in the past.
 
12GB required for USB keys/flash disks.
 
Whilst the information is obviously meant for Apple Mac computers, it's nevertheless 100% relevant to the 1st phase of creating USB installers for Hackintosh computers, the 2nd phase being the necessary installation of the bootloader (Enoch, Clover or otherwise).

A few things are required to successfully run macOS Catalina on a Hackintosh, whether through a new/fresh installation of a direct upgrade from a previous OS X/macOS version/release.
 
1/ Laptops Embedded Controller:
Since beta #5, macOS Catalina requires Embedded Controller (EC)-related patching for many laptops. It's therefore important to check your Embedded Controller device (aka "PNP0C09" id) in DSDT/ACPI and apply the mandatory device renaming to "EC" in Clover's config (or directly in DSDT), failing what, Catalina will never boot.
 
Most Dell laptops since the era of the Latitude E4x00/E5x00/E6x00 range have an Embedded Controller device called "ECDV" in DSDT; in Clover, the necessary ACPI device renaming is as follows:
Description: Changes ECDV to ECFind:  45434456Replace: 45435F5F Other known names for the Embedded Controller include "H_EC" or "EC0". If you find no Embedded Controller device in ACPI, this patch is not necessary.
 
2/ Clover:
Clover needs to be at a minimum version supporting Catalina. Versions r503x, r504x and r505x are generally Ok. At the date of general release of Catalina, we recommend using Clover r5093 as the minimum version. Clover versions are available off Dids' Github repo.
 
3/ Add-on kexts:
Lilu and associated plugins also need to be at versions updated for Catalina. At time of writing, we recommend the following minimum versions, all available off Acidanthera's Github repos:
Lilu v1.3.8 Whatevergreen v1.3.3 AppleALC v1.4.2