Follow the steps in
[Tutorial] How to find and un-delete AOO temporary files for
a) detailed instructions on how to recover your file as it was when you last opened or saved it, or as it was when it was last saved with AutoRecovery;
b) how to find previous versions of the file in the folder it is located in, but which have since been deleted;
c) how to un-delete the temporary files AOO wrote while you were editing the file, and then deleted. This will recover your file as it was when you last opened or you last saved it and is probably your best hope.
Before starting you need to know:
1. Were you editing a
previously saved .odt file? If so, follow the steps in the Tutorial.
2. Were you editing
a new file which had not yet been saved? If so,
and if you had set AutoSave ON,
and if an AutoSave had taken place, follow the steps in the Tutorial.
3. Were you editing
a new file which had not yet been saved? There is no hope.
4. Were you editing a .doc file, but you
did not have AutoSave ON? Or did you did have it ON, but an AutoSave had not yet taken place? There is no hope.
5. Did you have Save a backup copy set to ON? If so, follow the steps in the Tutorial and look for the backup files.
If you cannot follow the Tutorial ask someone with computer skills to do it for you.