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; see Transferring the settings. After upgrading EasyMP Monitor, copy the saved file back to its original location. When you open EasyMP Monitor, all the registered projectors will appear.