[sage-support] Re: Sage 9.0 macOS Jupyter Server failed to start

We often get reports of SageMath 8.x works but not SageMath 9.0 but it usually turns out that in such cases, the version that works was installed under macOS 10.14 Mojave, and that what is causing problems is that the version that fails to work was installed under macOS 10.15 Catalina. Have

[sage-support] Re: Sage 9.0 macOS Jupyter Server failed to start

I am having maybe a similar issue. Im on MacOS 10.15.3 I've successfully used 8.9 for quite a while. I downloaded *sage-9.0-OSX_10.15.2-x86_64.app.dmg .* I did the install selected SageMath-9.0.app in Applications.