Once you have downloaded the three files you need, follow the instructions in the htmltag user document to set up a Word template (.dot) file containing the htmltag macro.
For good practice reasons, a "ready assembled" template file is not available for downloading. If you went around downloading .dot files from any old website, you could easily find yourself with a virus on your PC.
Also, people who want to use htmltag need to have a basic familiarity with what macros are about. If you're deterred by having to paste the code from a text file into a template macro, then htmltag just isn't for you!
To download files: right-click on the link and select "Save link as" ("Save file as" or "Save target as" in some browsers.)