After upgrading EasyMP Monitor on my computer, no projectors appear on the screen when I launch EasyMP Monitor. What should I do?

• When a projector is registered, the settings are saved to a file called EMP Monitor.dat. When you upgrade to a newer version of EasyMP Monitor, this file is replaced with a new version. You need to register the projectors again for them to appear.
  
  To avoid having to re-register the projectors, copy the EMP Monitor.dat file to another location on your hard drive before upgrading EasyMP Monitor. After upgrading EasyMP Monitor, copy the saved file back to its original location. When you open EasyMP Monitor, all the registered projectors will appear.