Please ignore about 2 screens, as that was misleading.
I purchased TC2016 and installed it. It ran without problems and without error messages. Later, errors appeared, as shown in my post. As TC loads on my computer, it seems to take wrong turn and try to load some-thing from my previous installation, TC18. Perhaps my antivirus (McAfee) deleted a needed register entry, which caused this error, but I do not know if that is true, or kept registry entry for TC 18 while deleting that for TC2016 ...?. Mystery.