I would think that developers are not able to repeat your problems - crashes are usually fixed pretty quickly.
And to paraphrase you:
I have installed opera on different computers. On Windows 7 and 10. Nowhere the Opera Updater does cause an Opera Crash Reporter to appear, and neither the Windows error reporter. I have not a single time had Opera freeze my computer. Moreover, those problems never happen, is the opera running or not. Even if updates are enabled.
What means that I personally have never experienced any such problems with Opera. Yes, I have seen few strange bugs with some developer versions, but not constant crashes.
But I have read here about some problems with russian windows (7) - maybe those are related?
Have you supplied bug report to Opera? See https://bugs.opera.com/wizard/