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I'm trying to run app that uses an older version of python on a newer Mac version. The app says it works on 10.4 Tiger and I think it would be using an older version of of python on 10.4 mjb2lite.app The windows version works fine on Win10 as it includes the library also mjb2lite home page there is a Linux version as well. You simply drag the text file with chords Blues #40.mjb onto mjb2lite.app and it will create a midi file in the same folder (you will see the error).

Name: Blues #40
Meter: 4/4
Style: Swing
Key: F
Tempo: 132
Chorus: bars 1 to 12 (repeat 3 times)
Sections: 1A
| FMaj7 | Em7b5 A7 | Dm7 G7 | Cm7 F7 |
| BbMaj7 | Bbm7 | Am7 | Abm7 Db7 |
| Gm7 | C7 | FMaj7 D7 | Gm7 C7 |
| FMaj7 |

Is there any way around this like getting Mac to use an older version python if this is the issue ? The developer is retired from the project.

LuaStart
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  • You can always install an older version of Python, right? It's even simpler if you're using a tool like Conda. – AMC Mar 12 '20 at 21:16
  • I found a python installer back to 2.5 but 10.4.11 was shipped with 2.3.5, tried the 2.5 and still get this error https://stackoverflow.com/questions/514371/whats-the-bad-magic-number-error – LuaStart Mar 13 '20 at 03:25
  • How about finding a way to run macOS 10.4? It's awkward, but it might work. – AMC Mar 13 '20 at 23:48
  • I could make a WineBottler of the Win version. I tried changing the magic number in the .pyc to the current python version that didn't work. I couldn't downgrade python to 2.3.5 with homebrew or macports. – LuaStart Mar 14 '20 at 03:13
  • I’m guessing you’ve seen [this page](https://www.python.org/downloads/release/python-235/) already? – AMC Mar 14 '20 at 03:56
  • Yes there was just a Windows installer. I got it to work using "wine cmd" in the terminal and used the command line on the Win exe. – LuaStart Mar 14 '20 at 10:51

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