Update failed macOS 15.0.1 > 15.1

DNS was already configured correctly before starting the update, but it took several times to (re)download the update anyway and once dowloaded it did not want to start the updating process several times. On failing, it started downloading again. My Mac now finally gives in. Black screens, every now and then with an apple and progress bar on it, for quite some time. It now estimates the time left to install, although never estimated correctly. Fingers crossed.

Same exact issue...please update us when this issue is addressed...I've never had so much trouble installing an OS update on a Mac before...

Have the same problem. The file is downloaded. Then my MBP starts "preparing" to end up with the same message as above.

The safe mode didn’t help, I am afraid.

I tried again 3 times today, still getting the same error

Same issue this morning.

So far this has not worked for me.

This worked for me.

I still have this problem, even changing the DNS to Google servers did not help.