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Security Update 2021-001 Catalina, Security Update 2021-001 Mojave

Jamesbond007

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Apple has finally released standalone updaters for the Mojave and Catalina Security Updates :
Catalina 2021-001 Security Update
Mojave 2021-001 Security Update
Mojave 2021-002 Security Update
Catalina 10.15.7 Supplemental Update

Note that the Catalina Supplemental Update is still labelled "2021-001 Security Update" on the Apple Support Download site.
A supplemental update for Security Update 2021-001... Glad Big Sur should finally get rid of the confusion.
 

Jamesbond007

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A supplemental update for Security Update 2021-001... Glad Big Sur should finally get rid of the confusion.
I would say there will be no great confusion if Apple just called it "Catalina 2021-002 Security Update" instead of Supplemental Update. It is Apple which contributes to this unnecessary confusion.
 
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Backed up with Carbon Copy Cloner.
Downloaded, Installed the Security Update.
3 Reboots: Insured the drive with "install" in the name was selected each time in clover until it was no longer an option.

Success!

19H524 Catalina Security Update .png


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I would say there will be no great confusion if Apple just called it "Catalina 2021-002 Security Update" instead of Supplemental Update. It is Apple which contributes to this unnecessary confusion.
Even editors on Wikipedia were confused by Apple that I had to fix.
 
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Supplemental Update that came just after Catalina 2021-001 security update seems to have installed smoothly.
 

Jamesbond007

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I used the standalone updates (Mojave 2021-002 / Catalina 10.15.7 Supplemental (actually supplemental to 2021-001)) to install on my Mojave 10.14.6 and Catalina 10.15.7 installations. No apparent issues so far. Installed onto a test disk using my third system and then cloned the installations back to my main system using SuperDuper. I use Clover 4920 for Mojave and Clover 5119 for Catalina.

Run the updater on Mojave / Catalina and reboot when requested. When the Clover screen appears choose the option with "MacOS Install". May need to do it more than once.

The Mojave 2021-002 Security Update includes the contents of and supersedes the 2021-001 update. So there was no need to install 2021-001 before 2021-002.

Likewise, the Catalina "10.15.7 Supplemental Update" includes the contents of and supersedes the 2021-001 update. No need to install 2021-001 before the supplemental update.
 
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Used standalone installer for Mojave (2021-002) with Clover 4934 on my system, no issues. Build 18G8022
 
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I had random shutdowns while installing with software update.
Smooth install with the standalone updater. Catalina 19H524.
 
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