Thanks for your answer.
I played around and searched for a bit longer and then gave up. I will just continue using Twine online where it works great!
There is no Twine binary file in the 64 bit Linux pack I downloaded.
As mentioned in the link you gave, there is a browser version available. The link to download this has changed to https://github.com/klembot/twinejs
Please do not regard my question or this comment as a complaint or criticism in any way. I am grateful for and appreciate the work everyone does on projects such as Twine.
I posted my question because I thought it may help others.
Once again, thanks for answering.