function canWrite(path, callback) {
    fs.access(path, fs.W_OK, function (err) {
        callback(null, !err);
    });
}

function downloadFile(url, target, target_name) {
    canWrite(target, function (err, isWritable) {
        if (isWritable){
            electronDl.download(
                BrowserWindow.getFocusedWindow(),
                url,
                {
                    directory: target,
                    filename: target_name
                }
            )
            console.log("Downloaded from: " + url + " to: " + target);
            return true;
        } else {
            console.log("No permission to write to target");
            return false;
        }
    });
}
downloadFile(REMOTEURL, app.getPath('userData'), 'sessionfile.json');