@albertop Thanks for your reply!

1. Win10 build 19041.1
2. Opera latest (indeed 69.0.3686.77)
3. Just clicking on the install link on this page (https://addons.opera.com/en/extensions/details/install-chrome-extensions/)

I noticed on github similar problems on different OS's.

Opera crashes when I try to install this extension. I tried to disable all extensions, but no luck. Any clues?