hello everybody,
I first installed Sage 9.4 on my IMac (Catalina 10.15.7).
It was running, but some old codes did not run. (I know these codes are 
working on another computer which has Sage 9.3.) After deleting all Sage 
installation documents, 
I installed Sage 9.3, but Sage 9.3 did not work. On my screen, the 
following message seems:

│ SageMath version 9.3, Release Date: 2021-05-09                     │

│ Using Python 3.9.2. Type "help()" for help.                        │

└────────────────────────────────────────────────────────────────────┘

------------------------------------------------------------------------

(no backtrace available)

------------------------------------------------------------------------

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.

===============================================================

Can someone help me? What should I do to use Sage 9.3?

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