Below is a list of macOS versions. Scroll down to the one you are running on your computer. Paired with it is the list of Media Composer versions tested and officially qualified by Avid for that macOS. You will guarantee yourself issues if you try to run an unqualified version.

macOS 26.x qualified with MC versions:
2025.12
As of Ventura, Avid seems to be releasing a new version of Media Composer 2-3 times per year, whereas Apple is sometimes releasing OS updates monthly... So, do your best to keep your computer's OS in qualification with Media Composer.

macOS 15.x - 15.3.1 qualified with MC versions:
2024.12.2
2024.12.1
2024.12
As of Ventura, Avid seems to be releasing a new version of Media Composer 2-3 times per year, whereas Apple is sometimes releasing OS updates monthly... So, do your best to keep your computer's OS in qualification with Media Composer.

macOS 14.0 - 14.5.x qualified with MC versions:
2024.12.2, 2024.12.1, 2024.12
2024,10
2024.6
2024.2
2023.12
2023.8
As of Ventura, Avid seems to be releasing a new version of Media Composer 2-3 times per year, whereas Apple is sometimes releasing OS updates monthly... So, do your best to keep your computer's OS in qualification with Media Composer.

macOS 13.0 - 13.7 are all qualified with MC versions:
2024.12.2, 2024.12.1, 2024.12
2024.10
2024.6
2024.2
2023.12
2023.8.2
2023.8
As of Ventura, Avid seems to be releasing a new version of Media Composer 2-3 times per year, whereas Apple is sometimes releasing OS updates monthly... So, do your best to keep your computer's OS in qualification with Media Composer.

macOS 12.0 - 12.7.x are all qualified with MC versions:
2024.10
2024.6
2024.2
2023.12
2023.8.2
2023.8
2023.3
2022.12
2022.10
2022.7
2022.4
2021.12.5
2021.12.4
2021.12.3
2021.12.2
2021.12.1
2021.12
Incremental history of previous releases:
macOS 12.5.1 qualified with MC versions:
2022.10
2022.7
2022.4
2021.12.5
2021.12.4
2021.12.3
2021.12.2
2021.12.1
2021.12
macOS 12.3.1 qualified with MC versions:
2022.10
2022.7
2022.4
2021.12.5
2021.12.4
2021.12.3
2021.12.2
2021.12.1
2021.12
macOS 12.3.0 is NOT QUALIFIED
macOS 12.1.0 qualified with MC versions:
2022.10
2022.7
2022.4
2021.12
macOS 12.0.1 qualified with MC versions:
2021.12
macOS 12.0 is qualified with MC versions:
2021.12

macOS 11.7 qualified with MC versions:
Entire 2023 series
Entire 2022 series
Entire 2021 series
Entire 2020.12 maintenance series
macOS 11.6.x qualified with MC versions:
2022.7
2022.4
2021.12.2
2021.12
2020.12.6
2020.12.5
macOS 11.5.x qualified with MC version:
2021.9
macOS 11.4.x qualified with MC versions:
2021.9
2021.6
2020.12.3
macOS 11.3.1 qualified with MC version:
2021.5
macOS 11.2.3 qualified with MC versions:
2021.6
2021.5
2021.3
macOS 11.2.2, 11.2.1, 11.2.0 are: NOT QUALIFIED.
Apple security issues and data loss issues.
macOS 11.1 qualified with MC versions:
2021.6
2021.2
2020.12.2
2020.12.1
2020.12
macOS 11.0, 11.0.1: are
NOT QUALIFIED.

macOS 10.15.7 qualified with MC versions:
Entire 2022 series
Entire 2021 series
2020.10 - 2020.12.8.
macOS 10.15.6 qualified with MC versions:
2020.10
2020.9
2020.8
2020.6
2020.5
2020.4
macOS 10.15.5 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4
Note: with this macOS update, Apple fixed its own “Finder” bug.
macOS 10.15.4 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4
Urgent: Apple “Finder” bug (large files on RAIDs). Upgrade the macOS to 10.15.5 to avoid this Apple issue.
macOS 10.15.3 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4
macOS 10.15.2 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4
macOS 10.15.1 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4
macOS 10.15.0 qualified with MC versions:
2020.9
2020.8
2020.6
2020.5
2020.4

IMPORTANT: macOS Mojave is not qualified for any version of the Media Composer 2022 series.
macOS 10.14.6 qualified with:
Entire MC 2021 series, 2020 series, 2019 series, and
MC 2018.12.8-2018.12.15.
macOS 10.14.5 qualified with:
MC 2019.7, 2019.6, 2018.12.7, 2018.12.6
macOS 10.14.4 is NOT QUALIFIED
macOS 10.14.3 qualified with:
MC 2018.12.5, 2018.12.3, 2018.12.2
macOS 10.14.2 qualified with:
MC 2018.12.1, 2018.12
macOS 10.14.1 qualified with:
MC 2018.11
macOS 10.14.0 qualified with:
MC 2018.10

macOS 10.13.6 qualified with:
MC 2021.6, 2021.5, 2021.3, 2021.2, 2020.12.3, 2020.12.2, 2020.12.1 , 2020.12, 2020.10 , 2020.9, 2020.8 , 2020.6, 2020.5, 2020.4, 2019.12.4 , 2019.12.3, 2019.12.2 , 2019.12.1, 2019.12, 2019.11, 2019.9, 2019.8, 2019.7, 2019.6, 2018.12.15 , 2018.12.14 , 2018.12.13 , 2018.12.12, 2018.12.11 , 2018.12.10, 2018.12.9, 2018.12.8, 2018.12.7, 2018.12.6, 2018.12.5, 2018.12.3 , 2018.12.2, 2018.12,1 , 2018.12.0 , 2018.11, 2018.10, 2018.9, 2018.8
macOS 10.13.5 qualified with:
MC 2018.7.1 (2018.7.0 on Windows)
macOS 10.13.4 qualified with:
MC 2018.5
macOS 10.13.3 qualified with:
MC 2018.4, 2018,3, 2018.2
macOS 10.13.2 qualified with:
MC 2018.1, MC 8.10.0
macOS 10.13.1 qualified with:
MC 8.9.4
macOS 10.13.0 qualified with:
MC 8.9.3

macOS 10.12.6 qualified with:
MC 2019.12.4 , 2019.12.3, 2019.12.2 , 2019.12.1, 2019.12, 2019.11, 2019.9, 2019.8, 2019.7, 2019.6, 2018.12.15 , 2018.12.14 , 2018.12.13 , 2018.12.12 , 2018.12.11, 2018.12.10 , 2018.12.9 , 2018.12.8, 2018.12.7 , 2018.12.6, 2018.12.5, 2018.12.3 , 2018.12.2 , 2018.12.1 , 2018.12.0 , 2018.11, 2018.10 , 2018.9 , 2018.8, 2018.7, 2018.5 , 2018.4 , 2018.3, 2018.2 , 2018.1 , MC8.10.0, 8.9.4, 8.9.3 , 8.9.2, 8.9.1
macOS 10.12.5 qualified with:
MC 8.9.0, 8.8.5
macOS 10.12.4 qualified with:
MC 8.8.5, 8.8.4, 8.8.3
macOS 10.12.3 qualified with:
MC 8.8.2, 8.8.1, 8.8.0
macOS 10.12.2 qualified with:
MC 8.7.2
macOS 10.12.1 qualified with:
MC 8.7.0, 8.6.5
macOS 10.12.0 is NOT QUALIFIED

OSX 10.11.6 qualified with:
MC 2018.11, 2018.10, 2018.9, 2018.8, 2018.7.1, 2018.5, 2018.4, 2018.3, 2018.2, 2018.1, MC 8.10.0, 8.9.4, 8.9.3, 8.9.2, 8.9. 89.0 8.8.5, 8.8.4, 8.8.3, 8.8.2, 8.8.1, 8.8.0, 8.7.2, 8.7.0, 8.6.5, 8.6.4, 8.6.3, 8.6.2
OSX 10.11.5 qualified with:
MC 8.6.1, 8.6.0
OSX 10.11.4 qualified with:
MC 8.5.3
OSX 10.11.3 qualified with:
MC 8.5.2
OSX 10.11.2 qualified with:
MC 8.5.2, 8.5.1, 8.5.0
OSX 10.11.1 qualified with:
MC 8.5.2, 8.5.1, 8.5.0
OSX 10.11.0 is NOT QUALIFIED

OSX 10.10.5 qualified with:
MC 2018.7.1, 2018.5, 2018.4, 2018.3, 2018.2, 2018.1, MC 8.10.0, 8.9.4, 8.9.3, 8.9.2, 8.9.1, 8.9.0, 8.8.5, 8.8.4, 8.8.3, 8.8.2, 8.8.1, 8.8.0, 8.7.2, 8.7.0, 8.6.5, 8.6.4, 8.6.3, 8.6.2, 8.6.1, 8.6.0, 8.5.2, 8.5.1, 8.5.0, 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.4.1, 8.4.0, 8.2.6, 8.2.5, MC 7.0.7, 7.0.6.3, 7.0.6.2, 7.0.6.1, 7.0.6, 7.0.5
OSX 10.10.4 qualified with:
MC 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.2.5
OSX 10.10.3 qualified with:
MC 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.4.1, 8.4.0, 8.2.4, MC 7.0.4.4
OSX 10.10.2 qualified with:
MC 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.4.1, 8.4.0, 8.3.1, 8.2.3, MC 7.0.4.3
OSX 10.10.1 qualified with:
MC 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.4.1, 84.0, 8.3.1, 8.3.0, 8.2.3, 8.2.2, MC 7.0.4.2 (Performance issues seen on: 2013 MacPro and Westmere MacPros. For these machines, upgrade to macOS10.10.2 or higher.)
OSX 10.10.0 qualified with:
MC 8.2.3, 8.2.2, 8.2.0

OSX 10.9.5 qualified with:
MC 8.7.0, 8.6.5, 8.6.4, 8.6.3, 8.6.2, 8.6.1, 8.6.0, 8.5.3, 8.5.2, 8.5.1, 8.5.0, 8.4.5, 8.4.4, 8.4.3, 8.4.2, 8.4.1, 8.4.0, 8.3.2, 8.3.1, 8.3.0, 8.2.3, 8.2.2, 8.2.0, 8.1.0, MC 7.0.7, 7.0.6.3, 7.0.6.2, 7.0.6.1, 7.0.6, 7.0.5, 7.0.4.1, MC 6.5.4.7, 6.5.4.6, 6.5.4.5, 6.5.4.4
OSX 10.9.4 qualified with:
MC 8.2.3, 8.2.2, 8.2.0, MC 7.0.4.1
OSX 10.9.3 is NOT QUALIFIED
OSX 10.9.2 qualified with:
MC 8.0.0, MC 7.0.4, MC 6.5.4.2
OSX 10.9.1 qualified with:
MC 7.0.4, 7.0.3, MC 6.5.4.1
OSX 10.9.0 qualified with:
MC 7.0.4, 7.0.3, MC 6.5.4.1

OSX 10.8.5 qualified with:
MC 8.3.1, 8.3.0, 8.2.3, 8.2.2, 8.2.0, MC 7.0.4, 7.0.3, MC/SY 6.0.5.1 patch
OSX 10.8.4 qualified with:
MC 7.0.4, 7.0.3, 7.0.2, 7.0.0, MC 6.0.5
OSX 10.8.3 qualified with:
MC 6.5.3, MC/SY 6.0.5
OSX 10.8.2 qualified with:
MC 6.5.3, 6.5.2, MC/SY 6.0.5, 6.0.3
OSX 10.8.1 qualified with:
MC 6.5.2
OSX 10.8.0 qualified with:
MC 6.5.2, MC/SY 6.0.3

OSX 10.7.5 qualified with:
MC 7.0.4, 7.0.3, 7.0.2, 7.0.0, MC 6.5.5, 6.5.4, 6.5.3, 6.5.2, 6.5.0, MC/SY 6.0.5, 6.0.4, 6.0.3.2 patch, MC/SY 5.5.5, 5.5.4, 5.5.3.6 patch, 5.5.2
OSX 10.7.4 qualified with:
MC 6.5.5, 6.5.4, 6.5.3, 6.5.2, 6.5.0, MC/SY 6.0.5, 6.0.4, 6.0.3
OSX 10.7.3 qualified with:
MC 6.5.2, 6.5.0, MC/SY 6.0.3, 6.0.1, MC/SY 5.5.5, 5.5.4, 5.5.2
OSX 10.7.2 qualified with:
MC 6.5.2, 6.5.0, MC/SY 6.0.1, 6.0.0
OSX 10.7.1 qualified with: MC 6.5.2, 6.5.0, MC/SY 6.0.1, 6.0.0
OSX 10.7.0 qualified with:
MC/SY 5.5.5, 5.5.4, 5.5.3

Here's the link to the LEGACY VERSION MATRIX. Have fun scrolling!