Installation failing when saying "y" to continue installing...

[Andy Frew]

Following the steps to install Phraseanet on our webserver using terminal in cPanel.

When I get to the "Phraseanet is going to be installed, continue ? (N/y)?" line, it type "y" and when I hit enter, I get the following:

 [Symfony\Component\Debug\Exception\ContextErrorException]
  Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?

I've got VERY limited terminal experience...just basic html and some php, but so many of the discussions around this error are way over my head. Is this something a mostly-noob can fix, or do I need to hire someone to do this for me? 

[Andy Frew]

Tried on 2 other sites I host on my reseller server (siteground hosting). It worked on one and not on the other. It's my understanding that they're all configured the same way, so it's strange to me that they'd respond differently.

On the site I was able to run the install, I'm not able to actually figure out where to go to start using the software. Is there not an index.php file somewhere that should launch it?