throws AddonFatalException {
try {
setInstallRoot(installRoot);
File addonDir = new File(installRoot, ADDONS);
File[] files =
addonDir.listFiles(new InstallerFileFilter(addonName));
if (files == null || files.length == 0 ) {
throw new AddonFatalException
(localStrings.getString("addon.installernotfound", addonName));
}
if (files.length > 1 ) {