Re: speechhub add-on installation error
This does not appear to be an official NVDA add-on, and by that I mean that its developer has never submitted it for vetting and inclusion on the "official add-ons page:"
The SpeechHub main page is: https://www.speakon.org.uk/SpeechHub.html
On that page they note that a brand new version was released last month that's compatible with NVDA 2019.3.1 and later with a link to the page where it can be downloaded. On that page, the download is not "front and center" but is a good deal of the way down the page with a click-through link that reads, "here."
If this is not the version that you have it's the one you need to get. Pay attention to the installation instructions under the "here" link for downloading.
If the new version installer does not work, it is the developers of the add-on that need to be contacted first. If they believe the issue lies with NVDA, they should initiate an issue report on the NVDA Github page.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Science has become just another voice in the room; it has lost its platform. Now, you simply declare your own truth.
~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019