private ProductInstance getInstalledProduct(ProductRelease productRelease, VM vm) {
   ProductInstanceSearchCriteria criteria = new ProductInstanceSearchCriteria();
   // criteria.setVm(vm);
   criteria.setProductRelease(productRelease);
   try {
     return productInstanceManager.loadByCriteria(criteria);
   } catch (EntityNotFoundException e) {
     return null;
   } catch (NotUniqueResultException e) {
     return null;
   }
 }