If you're interested in VSTa (it's an historical oddity, and it is no longer developed), I've moved the primary copies of available text and documentation to a Gopher server.

You can reach it here.

If your browser doesn't support Gopher (tisk), you can try via the WWW-to-Gopher gateway; the VSTa gopher content would be reached via here

The source code--including history going back to its earliest days--is hosted at Github.

Andy Valencia's (very humble) home page is here. Expect it to migrate to Gopher at some point.