getSetupFrame().setButtonEnabled(false, getSetupFrame().BUTTON_PREVIOUS);
Thread t = new Thread() {
public void run() {
InstallData installData = InstallData.getInstance();
if ( ! installData.preInstallDone() ) {
getSetupFrame().setButtonEnabled(false, getSetupFrame().BUTTON_NEXT);
Controller.checkPackagePathExistence(installData);
Controller.checkPackageFormat(installData);