X-Rite decided to focus on their industrial color management devices, so the consumer X-Rite product line was shifted over to the new consumer-oriented Calibrite company, who have continued software support for ColorMunki hardware, at least for now. Although the ColorMunki has been replaced by newer devices, Calibrite still supports the ColorMunki with their old software and new software. You can download both here:
https://calibrite.com/us/software-downloads/
The old software is ccStudio. I think this is still free.
The last update was June 2023.
The new, redesigned
Calibrite Profiler software requires a small one-time (I think) fee. There is a Demo Mode that you can use without paying.
The last update was a month ago.
It’s not really clear whether Calibrite Profiler works with all of the ColorMunki Display, Photo, and Design variants, so it might be a bit of trial and error to figure out which download works best for the one you have.
Although you can still download ColorMunki software from the X-Rite website, you can see that the last update there was seven years ago (2017). The software on the Calibrite site is much more up to date.
ArtIsRight has an overview of the Calibrite Profiler software on his YouTube channel.