Plans deleted after unistal all version

[VictoriaGZ]

Hi!
I decided to unistall an old version of Sweet Home (I think it was the first one I installed 4 years ago) Now I have 6.1 version, and it's ok, library, new furniture that I've added during all theese years, but ALL the plans/desings I've created and saved are GONE/DELETED.
How is possible that were deleted when I still have the program installed and runnig?? Is there any way to get those files??

Thank you in advance for any help!

Victoria