public URL downloadUrl(String genomeVer) {
		try {
			String version = SnpEff.VERSION_MAJOR;

			// Replace '.' by '_' 
			version = version.replace('.', '_');

			String urlRoot = getDatabaseRepository();

			StringBuilder urlsb = new StringBuilder();
			urlsb.append(urlRoot);
			if (urlsb.charAt(urlRoot.length() - 1) != '/') urlsb.append("/");
			urlsb.append("v" + version + "/snpEff_v" + version + "_" + genomeVer + ".zip");

			return new URL(urlsb.toString());
		} catch (MalformedURLException e) {
			return null;
		}
	}