My apologies for the delay in replying – just been rather busy lately.
Thanks for the pointer – it does appear to be a change in name that was the problem. I’m running Publii on OSX, when I downloaded the update because the original version was in the download folder the new version zip file got renamed “taste-2”. I deleted the old versions from the download area, renamed the updated theme zip back to “taste” – re-installed it and it all worked fine.
Thanks again for your help.