When you buy a voice it selects the Text Speaker application also but you can deselect it. After the purchase you get a link to the file for instance Emma.exe. Running this starts the installer looking like this:
I bought Amy about 2 years ago for € 39,-- (from Harpo.com) and Emma in October 2016 for € 29,-- (from Deskshare.com)
Before buying Amy I tried the evaluation download and that expired after a month IIRC so you could also try it out first (I see on Deskhare you can also download the evaluation version)
Thanks. Wish I had known about this before I spent the $45 for the Amy voice, but I'm not unhappy with my purchase.
Thanks again.