Tried to install the update to macOS 10.14.4 on the weekend. The Mac hung. I left it 20 hours (overnight) just in case, not to no avail.
After rebooting I tried running Disk Utility - First Aid on the boot volume in case there was an unexpected corruption. It started v_e_r_y s_l_o_w_l_y scanning the Time Machine snapshots, of which there were 20. It took at least 15 minutes to scan each snapshot. I left it after about 3 and went out. Came back a few hours later and it was doing number 6. I left it another couple of hours and it didn't move, hung again, so I restarted it again.
While it was busy, I setup an old Dell workstation to use. But in the new house the router is too far away, and the Dell did not have WiFi. Fortunately I had an old wireless card in the drawer, so I stuck it in the Dell and booted up. No driver. A couple of seconds further search through the drawer revealed the driver installation CD (yes, an older card), and the Dell has a DVD drive, so I installed the driver and rebooted.
Still no joy.
Reading the documentation revealed that teh driver supported up to Windows XP, and I had Windows 7.
A quick trip to the manufacturer's web site revealed that they only supported up to XP for this old card.
A few searches later suggested that the chipset was compatible with a couple of other drivers, so I tried those one after the other.
Each one involved downloading the driver on my other half's PC, copying to USB stick, transferring to the Dell, and installing. And, of course, rebooting. No luck.
Eventually I gave up, removed the WiFi card and used an extra-long network cable instead.
Based on searches, I tried getting Windows to find a driver online. It did! I installed it, and instead of an unknown network adaptor appearing in Device Manager, it was now showing as an Intel something Device - like a chipset or something like that. Can't remember.
And still no WiFi.
Why is computering so hard? And I know what I am doing (more or less). I can't imaging how difficult it would be for people who do not understand the technology.
At least faffing about with the Dell occupied me until I decided to restart the Mac.
Or ... wasted most of my weekend, to put it slightly differently.