Stuck trying to get my noggin around callbacks

hehadnodebodytogowith.js

/**
 * getWpVersionInfo - gets the lates WordPress version and download links
 * @param  {Function} cb Callback function that is neccessary for data and errors
 * @return {Object}   Thisreturns selected data extracted from the api/json request
 */
function getWpVersionInfo(cb) {
    // Pass the API details to the http.get method
    return http.get({
        host: 'api.wordpress.org',
        path: '/core/version-check/1.7/'
    }, function(response) {
        // Ensure we get a usable encoded file
        response.setEncoding('utf8');
        // Instantiate body as a blank var
        var body = '';
        
        // Collect all the Async data into the body var
        response.on('data', function (chunk){
            body += chunk;       
        });
        // On async completion parse the JSON or handle any parsing errors that arise
        response.on('end', function(){
            try {
                jsonData = JSON.parse(body);
            } catch (err){
                console.error( chalk.red('Unable to parse WordPress Version from JSON.'));
                return cb(err);
            }

            // Callback for handling errors and results
            cb(null, {
                wp_version: "Latest Version: " + jsonData.offers[0].current,
                wp_full_download: jsonData.offers[0].packages.full,
                wp_no_content_download: jsonData.offers[0].packages.no_content 
            });
            
        });

    // Handle any errors with the request
    }).on('error', function(err) {
        console.error(chalk.red('Error with request:', err.message));
        cb(err);
    });

}


// This totally works just fine
/*getWpVersionInfo(function(err,result){
   console.log(chalk.green(result.wp_version));
   console.log(chalk.green(result.wp_full_download));
   console.log(chalk.green(result.wp_no_content_download)); 
});*/

// This doesnt work and I can't get my head around how I should do it
// I need to get the string from 'result.wp_no_content_download' available as a var within installWordpress
function installWordpress(){

    getWpVersionInfo(function(err,result){  
        var wp_download_location = result.wp_no_content_download;
    });

    console.log(wp_download_location); //Nope

}

installWordpress();