how to downgrade macos to an older version

8:05

4:57

12:36

6:09

9:13

2:45

3:48

8:49

3:40

2:10

7:14

7:22

8:41

8:10

16:43

11:28

6:14

2:43

00:28

1:45

16:29

9:42

6:24

12:35

3:41

8:08

9:33

18:53

10:00

1:44

5:01

9:27

15:38

21:16

7:33

11:06

12:48

7:38

9:06

12:53

9:36

8:03

5:47

4:06

3:45

10:12

1:25

5:18

12:04

6:09

5:04

2:53

9:52

1:59

8:13

3:24

2:45

3:26

6:33