I used OneDrive as that is where I saved it - I use onedrive to save all these little programs to save downloading them again and again.
If you have just download it - it will be probably still be in your downloads folder
The important thing is the path in the administrator cmd prompt contains the sync.exe object. You can check by changing the path and then entering dir and see if you can see it. It should look like this:
Microsoft Windows [Version 10.0.10565]
(c) 2016 Microsoft Corporation. All rights reserved.
Volume in drive C is Windows-vm1
Volume Serial Number is 3EA0-230C
Directory of C:\Users\hali\Downloads
13/10/2015 16:05 <DIR> .
13/10/2015 16:05 <DIR> ..
01/11/2006 14:05 150,328 sync.exe
1 File(s) 150,328 bytes
2 Dir(s) 14,006,308,864 bytes free