How do I install LT for desktop Word?

I just downloaded for desktop use. and it’s in the downloads folder. What do I do to get it to attach to Word desktop? There are four folders and a bunch of files. Which one will execute and run the program?

Use of LT in MS Word is described at GitHub - jaumeortola/languagetool-msword10-addin: LanguageTool Add-in for MS Word, but please note the add-on is still a beta version.