It's the exact same error message (copied and pasted from WordPress) as the previous post which is why I commented on that particular post. It is identical, hence, the identical post with no more to add.
It would be interesting and helpful to find out if the other post is also using a Windows server (another reason I posted on that same post) and perhaps has a similar setup which might help identify the problem. In my 45 years of programming and excellent track-record of error resolution, I have found it often useful to share information between others with identical errors because it helps identify patterns and resolve errors.
I'm also curious if the directory structure (subdirectory versus root) could cause this problem.
I have my own servers, so there is no contacting hosting providers. I was installing WordPress to demo it for a client. I was not able to do the simplest upgrade which is what prompted me to solicit assistance from this forum.
If anyone else would like to post resolutions on this issue, I welcome you to join. I will not take it as impolite. I will take it as helpful and useful and be most appreciative.