Question: "Where Can I Download Device Manager for Windows?"
Answer: Device Manager is a feature of Windows itself so there is no need to download it.
Downloading Device Manager is possible in theory but there's little reason why you'd want or need to.
There are several different ways that you can access Device Manager, all of which differ somewhat depending on which version of Windows you're using:
Access Device Manager in Windows 8
Access Device Manager in Windows 7
Access Device Manager in Windows Vista
- Access Device Manager in Windows XP
If what you're really after is to download drivers, and not actually Device Manager itself, see How To Find and Download Drivers From Manufacturer Websites for help.