Based on the 2nd dump and "I had clicked on a file that resided on a network share to install it" comment in the email, I think the problem is your antivirus.
Windows Defender is quite bad these days at slowing processes down, especially if you go anywhere near large installer executables. It doesn't cache results of previous scans and blocks the entire program from continuing while it scans the file each time it is opened.
Try disabling Windows Defender and see if that helps.
You can also do some things to make Opus less likely to trigger it:
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Under Preferences / Folder Tree / Contents, turn off Zip files and other archives.
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(Alternatively to the above: Make sure Preferences / Zip & Other Archives / Zip Files: Hide from tree includes
.exeso those are not shown in the tree, at least.) -
Turn on Preferences / Folders / Folder Display / Show generic icons for for the type(s) of drives your installers are on. (Unfortunately, just reading the icon for a .exe file triggers antivirus to scan the entire thing as if you were going to execute it. This is a bug in Windows IMO; it opens the file the wrong way when reading icons, but it's outside of our control.)
The original and new dump also have something in common which is a thread that is getting information about video files in one of the visible folders. That could be involved, but it seems less likely. It shouldn't normally block anything, and the new dump definitely looks like the problem is with antivirus scanning an exe file.
Another thing to check is that the process priority (right-click dopus.exe in Task Manager's Details tab) is set to Normal. We recently found something that means it can be set to Below Normal in some situations (e.g. after installing an update, before rebooting). That could be slowing things down a little if the machine is under load. It's probably not causing the whole problem, but it's worth checking. (It'll be fixed in the next update, too.)