Catalina 10.15.7

 Even Mojave has some supplemental update and security update.

After a few months I itch to upgrade again.

No surprise, the Catalina patch still won't go through the second phase.

Every time I do this I do this in a feverish pace and in the end, I don't know what I am doing.

But I have to say I am calm and a little bit more prepared.  When it failed to boot up to continue the second phase.  I was able to recover from the Mojave recovery snapshot though I forgot the details.  But it certainly emboldened me to go really to Catalina instead of just going update Mojave as I know initially I was able to upgrade to Catalina but somehow in subsequent update I wasn't able to complete.

No surprise I wasn't able to go to the second phase of the patch to complete but then it didn't destroy the last bootable OS I was able to boot back holding the Alt or Option key.

So here are the steps

Download the latest Catalina patch from dosdude1

Make the USB drive

Boot from the USB drive (for me I have to switch back to the supported GPU card, otherwise I can't do this ALT boot sequence)

The installation reboot and back to the USB installation screen and in some instances it gives me the mouse setup, just click Next or similar to back out

Reboot holding down Alt key, you should see the Install partition of whatever it's properly called, you should see the USB and other possible Boot EFI from previous failed upgrades but pick the installation thingy you've never seen before that was just created in the first phase of the update

This should complete the second part of the installation.

Once it reboots you should be home free 

Good luck.

PS:  you won't be able to stream Netflix on Safari, but Chrome is perfectly fine.

Mac Storage space can vary a lot, I mean a lot between Disk Util and Mac Storage

If you can a meager size SSD and some 4TB HDD and use time machine, you will have a hard time when try to re-install the OS to the SSD with you simply delete files or moving files around.  No matter how hard you try or how much free space you you squeeze out on storage, it doesn't matter as long as Disk Util says you only have a few GB available.  Even after you disable Time Machine along the way.

I'm sure I found a similar solution but I just forgot and in retrospect that might not be as effective as this one here.

https://youtu.be/JfvYkhXrqAs


Terminals codes - sudo tmutil listlocalsnapshots / com.apple.TimeMachine.2017-12-19-151241 com.apple.TimeMachine.2017-12-19-151441 com.apple.TimeMachine.2017-12-19-153720 tmutil deletelocalsnapshots 2017-12-19-151241


this frees up the space.

MacPro3,1 and Catalina macOS10.15.2

Everytime there is an update pushed out by Apple I tend to apply it and update my system.
My system being a MacPro3,1 early 2008 with a half ass supported or not quite supported graphic card is really a pain in the rear end when it comes to upgrade.  Mainly, I can't get in all those necessary reboot modes without the EFI or boot rom for the graphics.  So I have to pull the card and plug back in the original card which is mildly painful.  Everything adds up.  And in the end, what seems like a rather straight operation invariably ends up like life or death, at least for the system, operation.  Usually it spans for hours to get it done.

Again, it's a dosdude1.com patch.
download the patch
download the full Catalina install from Apple via the patch
create a Catalina bootable USB finger using the patch
reboot from the USB
And good luck.

Somewhere along those steps something will happen I guarantee you that.

I am not on macOS 10.15.2 after hours of patching ...