Update from 3.5.3 -- all at once?

You know, I really cannot understand you. We are going in circles. I told you that it didn't work when I simply renamed the folder (#18), then you said that (of course) it wouldn't work (#21), then later you told me to rename it (#23), then I reported the error message, and now you're telling me again why it won't work. If you know that it won't work, then why (twice) have you advised me to do it?