I can't reproduce now, even with re-installation of v8.1 and then update to v8.2.
This error already happened to me in the past with an older version, this is why I have created this thread.
I will monitor installation process next time, sorry for the noise.
Keep up the good work guys.
Let me know if you can somehow find conditions that trigger this, maybe it can be fixed, or at least the installer can be improved to show a reasonable error message (the one on the screenshot is misleading and not the real cause).