Alessandro Lai
Head of Platform @ Facile.it, @phpfig@phpc.social secretary, @MilanoPHP coordinator, computer science passionate, retired netgaming nerd
@joepferguson @ocramius @mbeccati
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@waterkip@defcon.social in your console recording, you created a composer.json with the platform settings, then you issued composer create-project.
That fails right away because it works only in an empty folder, it's a scaffolding command. What do you want to achieve, alongside forcing the PHP version?
In general, I would advise you to get a local dev environment with the right PHP version, not to fake it (use Docker, maybe?)