I have re-installed the full latest version of Opus to a new computer with Windows 10 Home.
Double click launch does not work.
I have tried some of the suggestions in this forum, eg selecting and unselecting the option, but nothing has worked thus far.
Standard installation of Windows 10, with the anti-virus that comes with the OS. But I wouldn't know how to deal with the anit-virus if I had to test that.
Assuming we're talking about the Desktop Double-Click feature:
Which option is selected under Preferences / Launching Opus / From the Desktop?
If you open Task Manager (right-click an empty space on the Windows taskbar, then choose Task Manager), and go to the Details tab, is dopusRT.exe running or only dopus.exe?
If you right-click the Windows desktop background and choose New Lister, does that work?
Does the Taskbar show any windows opening which might be offscreen? i.e. If no Opus windows are open and you try to open one, does a button for Opus appear on the taskbar even if no window is visible?
An antivirus, firewall or similar "security" tool is most likely blocking dopusRT.exe from launching, or killing it after it launches.
What happens if you keep Task Manager open, then select Preferences / Launching Opus / From the Desktop: Disable, then click Apply, wait a few seconds, then select Open the Default LIster and Apply again? Do you see dopusRT.exe appear in the Task Manager list, even briefly?