As the short review says, "it's a complete, efficient tool to manage and review your font collection." One of my favorite features is the ability to catagorize your fonts into groups/families you might use regularly, such as "sans-serif", "slab serif", "handwritten", etc.
The link I sent you must have been for the older version. I found what "appears" to be a new version for Windows 10. The first thing you should do is vet the site and the download to make sure it's legit. I'm still on Win7, so I have no need for it, but make sure you check it out and scan it with your virus software:
Another thing you might try with the older version is to run it in "compatibility mode", which will trick Nexus into thinking it's running on Windows 7. Here's where to figure out whether that will work: