How to install?

So, I’ve downloaded and unzipped v1.4.6 into a subdirectory of my website (intranet).

The installation instructions tell me to "Run the InvoicePlane installer from your web browser and follow his instructions: … "

I can’t find any type of “installer” . There is a setup folder under a bunch of other folders,
e.g. invoiceplane/application/modules/setup But I can’t see anything that would help me install it.

I am hosting this on our intranet server, Ubuntu 14.04 LTE and Apache2 .

I’m not an expert (yet) in administering Apache2 or Ubuntu and am still learning a lot on how to run programs in this environment. I have installed other software on this system usually through Ubuntu Software Centre. But I don’t know how I can get invoiceplane installed.

Help!

Which URL do you use to access your webserver?
As specified you have to open http://your-domain.com/index.php/setup where "your-domain.com" should be replaced with our own domain of your server.