Hey there Kienes,
It sounds like you are unable to successfully launch Logic Pro X because it keeps quitting unexpectedly when loading Motion. Without knowing the troubleshooting that has been done, I recommend starting by using the troubleshooting from the following article named:
Logic Pro X: Troubleshooting basics
If that does not resolve the issue, I would next try the troubleshooting in this article:
Motion 5: Troubleshooting basics
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