A brief update .... Was able to jack up the tire off the ground, as suggested and put a couple of ratchets around the tire. Then took a rubber mallet and started to rotate the tire and hit the side that was not seated. After some time and putting air into the tire the tire finally seated on the rim. Put the recommended pressure in the tire and checked it for a couple of days to see if it would hold.
It has held up and no leaks or loss of pressure. Than checked all the other tires, something this SC should have been doing all along. Front tires required air as did the other back tire which had less than 10 lbs. This tire was holding up but in time of not checking this regularly the same thing probably would have happened. They are not filled and are tubeless.
At this time I will check again that rear tire that went flat. Fortunately, only the left side of the tire was separated from the rim. So far, so good! I wouldn't have been able to do it without the help of Our Forum Family. Thanks for making my day, so far!