Your original request wasn't clear, but working on all your posts so far I gather that:-
-you've had a programme malfunction with NXT 5,
-you've decided to uninstall/reinstall NXT 5, but couldn't find it in your Windows 10 Apps & Features
-you then looked for a Creator uninstaller, but couldn't find that either
-you have kept a safe copy of your Roxio NXT downloads
Am I right so far? Hoping I am, here are my suggestions
 In the NXT series the number of installs you can make with your key is limited by Corel, so you're better off to first try a repair as suggested by Cdanteek in post #5. A repair doesn't take an install off the number permitted for your key.
To do a repair, copy your download files to your hard drive and run setup.exe When you're given the alternatives to Install, Uninstall, or Repair, choose Repair.
That should reinstall without deducting an install from your key.
 If the repair doesn't fix things for some reason, then you could try the clean uninstall. Roxio's clean uninstaller for Creator 2011, Creator 2012, and the NXT series is found here. [KnowledgeBase link]. The KnowledgeBase page describes how to use it, but essentially it's a batch file which runs the installer with a CleanSystem=1 parameter which makes it uninstall everything.
Don't worry that the file is called C2011_CleanSystem.bat. I just checked, and the setup.exe in NXT 5 will respond to the CleanSystem parameter.
How's that? Does this answer your questions?