I am using ver 10.04.0 X64, and recently had to do a rebuild of my W10. Ever since, it advises me that an update is available, but when I select the download button, nothing happens at all that I can determine. I have never had to set up proxy data before. What is wrong? The program is running normally otherwise.
You can download the latest Opus 10 installer here.
Since Opus 10 is very ancient now, it won't be getting any further updates, so that should be the only one you need worry about.
I had the same problem, thank you for the link.