I wrote before about how I prefer to download PDF files rather than have Opera open them. A previuos Opera update didn't respect my choice because it change the setting back to open in Opera.
So again I had to go and change the setting. The procedure is the same but the interface has changed.
In the address or URL bar type the following:
opera://settings/content/pdfDocuments
... and press enter. On the page that opens, there use to be a switch but now you have two more obvious choices. Click on the button before your choice. In my case, Download PDFs.
So I hope Opera respects my choice the next time round.