Can I interrupt installation process with preflight function?

by webchun   Last Updated May 12, 2019 06:10 AM

I'm trying to add a note to user when trying to install an extension / module.

Basically I want to add note before user continuing the module installation process when an older version found, and they can continue the installation process by clicking a button.

Is it possible to do that with preflight function? If it's possible how can I do that?

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