It depends on whether you're opening the file from a Creative Cloud version of InDesign or from a Creative Suite version of InDesign.
If you have an earlier Creative Cloud version of InDesign, when you open the file, you'll be prompted to let the Creative Cloud do the conversion for you (this includes InDesign CS6, downloaded from Creative Cloud). It will automatically create the IDML file and open in your current version.
If you have the perpetual license version of InDesign CS6 or an earlier version of InDesign Creative Suite, you're out of luck.
so i am out of luck or need to find someone who can do it for me around, thanks for answering
I completely join the answer of Steve as a correct answer.