Hi Niranjan,

There can be multiple factors why the installation failed but your issue headline (Mac Ventura) makes me think that its not necessarily Quartz causing the issue (but it still can) because if it is, the error will appear in the post installation i.e., when you are already running fsl from the terminal.

To rule out some potential causes, you have to check if you have an updated python installed in the system. Actually, fsl python library suggests python version 3.7, 3.8, 3.9, 3.10 based on the documentation (https://pypi.org/project/fslpy/). I believe python.org 

Another important thing to consider is to execute running the fslinstaller as an administrator.

It would also help if you know the content of fsl-6.0.6.2_macos-64.yml

Hope this helps.