Thanks a lot for the tips. I'll try them, but I have another question. Is it possible to install the new version in another location in order to keep the older one enabled, just in case or this can cause some interference?

I wanted to upgrade my Opera 12.16 to Opera 28, but I had to return to the old version (fortunately, I create a restore point before upgrading). First, Opera 28 is much slower than 12.16 and doesn't block pop-ups (even if the box is checked in preferences and with Turbo mode enabled). Next, Some bookmarks disappeared, I don't know why. Finally, I feel unpractical to open a page just to see the bookmarks.