Unable to install MailCarry

Hi,

I am trying to install MailCarry on a Digitalocean VPS, I have followed all instructions and even the domain.com/install shows a green tick on all options under 'Permission' section, remaining database details are fine as well however nothing happens when I click 'Install' button. Inspect elements reveals that it's sending a call to 'verify.php?xyz' which return 200 however there is another call to /installation which returns 404 error.

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