Hi Paul,
I think this is answered on the InfoVox FAQ page (that was hard to find!):
https://support.assistiveware.com/index.php?pg=kb.bookid=2
Look under the headings for Installation and Activation at the last few topics,
especially:
1.6. How do I upgrade from Infovox iVox 2 to Infovox iVox 3?
Hello Gordon and Esther,
Many thanks for your help and the pointer to the FAQ on upgrading to
infoVox-iVox 3.0. MY voices are now all activated and working again on 3.0. The
upgrade process was not exactly as described in the FAQ but after some initial
confusion it worked OK.
I am delighted