Update failure in CCleaner Bug Reporting Posted March 26, 2020 i too have this same problem and was one of the first to report it after the March 2020 update. I have the Pro version and am a paid subcriber. I also have windows 10 and trend micro. It appears to me to open like once a day. sometimes it will open and run, but if you try to open it again say an hour later you can't. This was not a problem prior and you could open it repeatedly all day long before this last update. I have tried to re-download the trila version and of course it re-installs. still happens. This only started after last update from CCleaner. There were no updates from Trend Micro during that time. I don't think any windows updates. so it is definitely a glitch here upon opening it. You can't open it from the desktop shortcut. sometimes you can open it from the start menu and get a run in. at this point it would be hard to even get a fix as if you can't open it you can't catch an update to fix it.