Cant upload modules!

[alanmercer]

I am trying to upload modules to the site but it says

1 error

1. zip is not installed on your server. Ask your host for further information.

But zip and gzip are both installed on the server, could something have went wrong with the installation??
What file tells the website to look for zip on the server??

Please please get back to me quickly dead line is running out!

Thanks in advance

[rocky]

That error message only occurs when the following line returns false:

if (class_exists('ZipArchive', false))

You need to figure out why the ZipArchive class doesn't exist. It's not a PrestaShop file, so you will need to ask your host and ensure this class is available.