What is the path to use when I install the voices for Captivate 2019?

That C:\users\public folder is not typically where the Captivate TTS voices get installed.

On a Windows system they would normally be installed here:

As Paul suggested above, you don't normally need to specify a different location than the default that the installer chooses.  What sometimes causes confusion is that Adobe has a two-step installation procedure that means step 1 (unpacking the install files) will ask you for a location because that part of the process is optional.  But step 2, which actually installs the apps on your system, should usually be left to do whatever it wants.

Unfortunately, when I downloaded the zip file, it was saved to my desktop. So when I opened it, it suggested installing the files on my desktop. I don't think that's a good idea. I guess I shouldn't have saved the zip file; just should have run it instead.