Installation:
1. Rename mypopupnotifier.pas to popupnotifier.pas.
   Edit (my)popupnotifier.pas and change:
   unit myPopupNotifier; to unit PopupNotifier;

	or

   You can use PopupNotifier.pas (I maked the changes)

2. Copy PopupNotifier.pas to
   Lazarus\lcl

3. Delete from lazarus\lcl\units\i386-win32 
   PopupNotifier.o and PopupNotifier.ppu

4. Rebuild from Lazarus your LCL

   Maybe you need to rebuild Lazarus  

5. Enjoy the changes!