Can I run Network Delay Simulator tool on Windows 10 64bit?
No, Network Delay Simulator doesn't work on the Windows 10 64bit due to compatibility. I've downloaded the only available version, but I didn't succeed installing it because the installer is broken. There is also no possibility to download a new version since the official website is discontinued as well.
There is another alternative called clumsy: http://jagt.github.io/clumsy/index.html