If NinjaTrader gives you a message similar to the following, check to see if your indicators are not working. They may still work, because it appears that this message sometimes occurs even though the Machine ID hasn’t changed.
If you find that any indicators aren’t working, copy your new Machine ID from the Help / About menu and re-authenticate it on the BCT Indicators Download page, accessible from the Member Dashboard. You don’t need to download and install the indicator again, but you may need to enter your new Machine ID and click the authenticate button for each indicator that doesn’t work after receiving this message.