private void searchJars(File folder) {
   File[] files = folder.listFiles();
   String version = null;
   try {
     version = Install.getVersion();
   } catch (IOException e) {
     version = "";
   }
   for (File f : files) {
     String s = f.getName();
     if (s.startsWith("matconsolectl")) {
       if (jarMCTL != null) {
         // if there are more than one files matching this, only one allowed
         jarMCTL = null;
         break;
       }
       jarMCTL = f;
     }
     if (s.startsWith("MEP_" + version)) {
       if (jarMEP != null) {
         // if there are more than one files matching this, only one allowed
         jarMEP = null;
         break;
       }
       jarMEP = f;
     }
   }
   checkJARPath();
 }