Unable to install macOS Catalina 10.15.7 Update

I had this problem a couple of days ago. A quick fix for this would be to reboot the system into Safe Mode by holding the SHIFT Button upon the system restart and rebooting back into normal mode. Did the trick for me.

Thanks Micus 1 but I have made the decision to downgrade back to Mojave. My Mac Mini has reached its plateau with Catalina ...Big Sur is a no go. Based on that, I have no desire to remain with Catalina ...probably one of the worst OS "upgrades" Apple has come out with. The remaining Catalina bugs/glitches will probably be addressed with Big Sur so to remain in Catalina means living with this crappy OS. I shouldn't have to go through all manner of gyrations to upload a simple security update and I shouldn't have to deal with a poorly designed and executed OS; this is *exactly* why I moved from Microsoft to Apple. But Steve Jobs legacy has fallen on people and a CEO who do not embrace Jobs' perfectionist, gotta be right before it's released, mindset; IMHO there's not much to distinguish Apple over Microsoft these days ...a shame. Both my Mac and me were happy with Mojave so I will be doing the downgrade.

I just ran into that issue, too! I downloaded the 10.15.7 dmg and it gave the same results as the normal update through System Preferences did--computer would restart, show the Apple and progress bar, and then show the login screen. After I would enter the user account password, the computer would log me in and nothing would happen. This may sound strange, but I finally got it to go after I temporarily turned on Automatic Login for that user account in the User's & Groups pane of System Preferences.

I realize you don't need the help anymore, Ferenc, but hopefully this can help others out yet.

Nevermind . . . I was convinced that it was working this time as I got not only the progress bar but a time estimate. Still stuck at 10.15.6 afterwards. Tried deleting my previous post but don't see the option to do so.

You've got what I was experiencing. I tried everything. Wasted far too much time. The last thing I did was to restart in "Safe Mode" and install using the direct download dmg file. If I'm not mistaken it finally worked and installed ...although the process left me doubting it's installation. After rebooting, the security update notification was gone. If you haven't yet tried, I would do the Safe Mode install with a direct download.

I had made the decision to downgrade back to Mojave even before I finally managed to coax the Catalina security update to install. Mojave worked (and works) great; I got my 32 bit programs back (not every software maker is kowtowing to Apple and their exclusive support for 64 bit software) and so far, updates install painlessly like they used to. My Mini had met it's plateau with Catalina; Big Sur was a no-go and I didn't want to get stuck with Catalina.

Hope you get it figured out.

Cheers.

Thanks Jocko,

I got it to go for real this time after freeing up even more space from the computer. It’s funny that I didn’t get any error message saying more space was needed and I thought I had great plenty, but apparently not.

Apple support had me restart in Safe Mode then run install while in safe mode. It worked for me.

I have the same issue....

I also have the same issue as described

any advice ??

Thanks

Have found this worked for me, Restart computer and immediately Hold SHIFT Key. That is Safe Mode. Let it run in Safe Mode for 15 minutes and restart in Normal mode

For the Record - the Internet Recovery Mode gave me the macOS 10.15.7. That is Erase and Clean Install procedure. Yet us hope the runaway process does not resurfaceL

Thanks Micus1 - It works here.

Cya!

Worked for me!

Same issue here, it was a lack of disk space (when using dmg file I've got the error). I made some place and reboot and the installation succeeded.

Exactly.