From OpenEMR Project Wiki
Hopefully you actually have the package and just need to know how to open it and then what to do with it.
You can get the most recent OpenEMR package at:
For Linux (unix) you need somefilename.tar.gz such as
I use my usual login user:
$ tar -zxvf openemr-2.8.0.tar.gz
$ mv openemr-2.8.0 openemr
$ mv openemr /var/www/html/