I have downloaded *sage-7.4-OSX_10.11.6-x86_64.app.dmg* (I'm under macOS 
10.12.1), and installed the app on the Applications folder. But when I 
launch it, on Terminal, it display this :

$ '/Applications/SageMath-7.4.app/Contents/Resources/sage/sage' 
--notebook=sagenb
                                                                            
     
Rewriting paths for your new installation directory
===================================================
                                                   
This might take a few minutes but only has to be done once.
                                                           
patching 
/Applications/SageMath-7.4.app/Contents/Resources/sage/src/build/cython_debug/cython_debug_info_sage.groups.old
     
*(...)*
     
patching 
/Applications/SageMath-7.4.app/Contents/Resources/sage/src/build/cythonized/sage/graphs/base/c_graph.c
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 7.4, Release Date: 2016-10-18                     │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
Please wait while the old SageNB Notebook server starts...
------------------------------------------------------------------------
0   signals.so                          0x000000010ebc84e5 print_backtrace 
+ 37
------------------------------------------------------------------------
Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
------------------------------------------------------------------------
Illegal instruction: 4

I have also tried *sage-7.4-OSX_10.11.6-x86_64.dmg*, and when I choose Open 
(with right-clic) on the sage executable on the folder SageMath (installed 
in Applications folder), the Terminal display this :

$ /Applications/SageMath/sage ; exit;
                                     
Rewriting paths for your new installation directory
===================================================
                                                   
This might take a few minutes but only has to be done once.
                                                 
patching /Applications/SageMath/local/bin/testlp3
     
*(...)*
     
patching 
/Applications/SageMath/src/build/cythonized/sage/libs/gmp/rational_reconstruction.c
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 7.4, Release Date: 2016-10-18                     │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
------------------------------------------------------------------------
0   signals.so                          0x0000000102b864e5 print_backtrace 
+ 37
------------------------------------------------------------------------
Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
------------------------------------------------------------------------
Illegal instruction: 4
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

I don't have tried SageMath before. Is SageMath incompatible with macOS 
Sierra? What can I do to run SageMath on my Mac under macOS 10.12.1 Sierra? 
Thanks.

I have verified that the md5 of the download file is the same as displayed 
on the download page.

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