macOS Catalina 10.15.4 won't be installed on my Mac.

Verify what macOS you currently have installed

>About this mac

If you are running the 10.15.3 and need to update to the 10.15.4 you can download directly the

Combo update macOS 10.15.4 https://support.apple.com/kb/DL2037?locale=en_US

If you still have an issue installing this combo, reboot into SafeBoot Mode— then launch the combo installer from this environment.

SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login to proceed.

Follow-up,

I learned about Apple Diagnostics: https://support.apple.com/en-us/HT202731

My thought was, great - now I can figure out the cause of my problem (unable to install OS X on my iMac). Unfortunately (or maybe not) the results were - "No Issues Found." Still searching for a solution.

Can you try to sign in as a root user, https://support.apple.com/en-in/HT204012, and in the safe mode, then try downloading the combo update again, and installing it again, it didnt work for me, even with system integrity protection off, even the "csrutil disable" command in command+r terminal didnt work, might work for you tho?

Update:

While trying to boot to my Catalina USB installer, I tried booting in Verbose Mode. Here is the installer log. I am still trying to interpret. The 2 of 2 log contains the ReportCrash results.

Thoughts?

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On my 2017 iMac with a 1TB WD Black NVMe M.2 and 2 TB SSD, which has ran like a top, I hit a brick wall on the 10.15.15 update. The install seems to stall (see attachment) for hours. I am going to boot from my clone, and try to download and install the combo update. If necessary I will try the “safe” boot mode if necessary. Very frustrating.

After 30 minutes, booting to the Catalina installer I am stalled again. This boot came from the Option key and boot to the installer. I tried root method, but the system never rebooted (black screen only).

Am I missing something here?

I tried the combo update yesterday and it didn't work. It's not a disk space issue. It downloaded okay, but when I tried installing it failed -- twice. If I click the update button on my system preferences, it does absolutely nothing; brings me back to the "update is available" screen.

I'm trying again now. Any other suggestions?

I had the same issue with 10.15.3 and to be honest i'm getting sick of this. I'm sick of wasting time trying to update my MAC which is only 2 years old. I carry out housekeeping on a regular basis. So Apple if you're trying to force us into replacing our MAC's you are barking up the wrong tree!!!

I switched my wifi network and it worked. My husband had installed a new wifi since we both work from home, but for some reason it wouldn't allow the download. We still need to research it more, but I was able to finally get it installed. I need the iMac for my job. Good luck!

Same problem here, i am still on MacOS Catalina 1.15.1, its a macbook air late 2018, just over a year old, 40 gbs available out of the 128, when i restart it thorough the update windows, i am back to 1.15.1, it just brings me back to the 'update is available screen', any workarounds for this, also where are the update files stored? The update ate up 5 gbs on my ssd, sad. And even if i update through the combo update, where and how can i remove the previous update files :C, I have tried installing it like 15 times now, tried reseting the PRAM, tried booting up in safe mode etc

I am consistently advised that MacOS Catalina 10.15.4 will install on my MacBook Air tonight! Despite leaving my MacBook powered up overnight, it never does, and it will not install if I go for manual install during the day! My MacBook is currently running on macOS Catalina 10.15.3, so what is the problem?

I tried upgrading to MacOS 10.15.4 on my MacBook Air (2018). The installation stalled and now I’m unable to boot machine. I’ve tried the safe mode and holding down the control/option and shift before holding down the start button. System will not boot up - very frustrating. I called Apple care and they recommend I FedEx computer to be fixed.

Any thoughts on how to get the system to turn on without sendOmg machine to Apple care?

How does a upgrade cause the machine to stop working entirely?

Thanks in advanced for your thoughts.

Andrew

Don't send it, shipping might get it destroyed. While booting press command + r, if you have a backup, skip this step, go into the disk utility, plug in an external HD, take a backup. Format the disk, APFS format, not mac os jornaled. Close the disk utility, don't restart you mac here or you will have to install high Sierra. Click on reinstall mac os, ensure your Internet is connected, follow on screen steps, select your HD, and reboot back into mac os.

By the way I am installing the combo update instead of the system one, becuz mine dosent want to install, idk why. I have 50 gbs free on my ssd

Have you tried to install it with over 20 GB of space available? Did it work?

I also have the same problem. I try to install 10.15.4 on 10.15.1 and every time I try to install, the installer shows up again after reboot. I have ca. 16 GB free space.

Hi there,

I tried doing this but it didn't seem to work after the installation. It just restarted and didn't complete the update.

Do you know how I can delete the software entirely from my computer? I deleted the disk after the installation..I'm not sure if that is the same thing.

Thank you!