The latest release of JBrowse is version 1.9.3. Download it here.
Then follow the tutorial instructions for pre-requisites (CPAN/Bioperl), installation and testing.
Human genome data:
For pre-generated tarballs of JBrowse JSON files for the human genome and (eventually) other organisms, check out our data releases.
See the developers page for details about how to install the development version of JBrowse.