Thank you Dave Yeo,
Your suggestion gave me exactly the information I was looking for. Thank you so much. I would never have found that on my own.
My question was prompted by my having updated today ArcaOS v5.0.0 to v5.0.6 which went perfectly to my absolute delight but upon conclusion of the update I realized I didn't see anywhere to determine the installed version number. So, thank you very much indeed for your reply.
Dave