I just downloaded Recuva for retrieving files from a failed hard drive (now attached externally). When I click on the desktop icon, it asks to make changes to my device, I click "yes" and then - NOTHING! How do I get this to work?
What operating system are you using?
Where did you download Recuva from?
Have you tried using the portable build from here
https://www.ccleaner.com/recuva/builds
What security software are you using?