It should be in a folder [or file] named "Core Temp" where ever it was directed to be located when you first downloaded it.
I directed it to be placed in My Documents for easy accessibility.
You can do a search for it by name by clicking on "start" and then "search" located under "help and support".
That is unless you wanted to know the website where to download it from:
If you do try to begin downloading it again, maybe you'll be able to see exactly where the website placed it by default. That should help give you an idea where your's is if you didn't choose another location for it.