Need to learn and have a question.

I recently downloaded LW and made the mistake of running my window washer and lost LW in that wash do I now need to download it again.? ( can not see LW anywhere on my computer )
I lost the few downloads I had also during this wash can I get any of this back or do I need to start again as im told once I had washed my computer with my window washer ill need to start again is this correct or can I recover LW and my downloads.?

Thanks in advance im new to this forum too so forgive me if this is posted in the wrong place.