Chapter in this post:
The complementary Update to macOS Catalina 10.15.6 came out of Apple yesterday. The notes say that it is supposed to fix crashes that occurred with virtualization software like VMware Fusion or Parallels Desktop. The update also addresses display errors that appeared especially with the 5K iMac from 2020 when it wakes up from sleep and also connection problems that existed with USB trackpads and mice.
In the notes of the installer you can read it like this:
It fixes a stability issue that can occur when running virtualization apps.
It solves an issue where the screen on an iMac (Retina 5K, 27 ″, 2020) can appear pale after it wakes from sleep.
Addresses an issue where certain USB mice and trackpads might lose connectivity
But there has been a little more done how to do it here at Apple can read:
The update also includes bug fixes and other improvements.
The size of the update file is almost 3 GB and, in my opinion, is quite extensive. The complete macOS Catalina installer, for example, only has 7,5 GB, so I am very surprised by the capacity of this small upgrade.
Most Macs are set to update automatically. But if you want to trigger it manually, the path leads over System settings> Software update.
There you start the update and then have to reboot the Mac. The update ran for a good 15 to 20 minutes before I was able to use my MacBook Pro again.
I've had a number of times lately where Parallels Desktop said goodbye in the background. My hope was that the update would fix this, but unfortunately it doesn't. My Parallels Desktop only ran a few minutes and then hung up when I was using other programs in the foreground.
As I could read in forums, the update to 10.15.4 resulted in a few that macOS could no longer boot. The solution back then was to unplug all USB devices and restart the Mac without any peripherals.
As far as I could read, no such case occurred with the current update to 10.15.6. However, it is always a good idea to make a backup before upgrading your system.
In my case, there were simply no noticeable changes. Parallels Desktop bugs that existed before are still running. ;-)
And Parallels diligently urges me every time I start the software that I should download the new version that is compatible with Big Sur. Sooner or later I'll do that, but the constantly recurring popup is extremely annoying ...
The new major update of macOS to version 10.16 "Big Sur" will probably come at the end of September. I think this minor update may be the last update to macOS Catalina before the new system comes out. And I'm really looking forward to Big Sur.
Here you will clearly notice that macOS is switching strongly towards iOS, which I am personally very happy about.
If the update to 10.15.6 caused problems for you, I would be happy if you could leave a little description of the error here as a comment for the other readers. Thanks!
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.