Clean My Mac X " can't be opened. What happened?

What misinformation did I post? Be interested to see your answer!

Well, it's all good & well that it has worked for you, but what should we tell all the people that have had trouble with CMM, or the people that AVAST/AVG sold all there doings?

We got the message, you think third party apps that claim to protect, clean, manage, boost performance are of value. Some of us disagree with your opinion.

+1👍

I assure you I have no problem with you doing that. That is the way you see this and it is your advice to people which is what this sight is all about. I AM NOT advising anyone to do anything.

Change your style then, because your original post gave some credence to these "snake oil" products as though they are a viable option.

Not denouncing them outright is implicit recommendation.

If you didn't have Clean My Mac, your computer would undoubtedly have far fewer problems than it does now.

CMM is complete garbage. Most experienced member here consider it malware.

Uninstall it completely.

Until you do so, any troubleshooting is completely pointless.

Once you have it removed, download etrecheck from the Mac App Store. It's free, and was written by one of the senior members here. It can generate a report of your system configuration that will give us a great deal of insight into what might be causing the problems you're having.

markeys6 wrote:

Some of us who are using our Macs to access government computers via VPN are required to use Avast or similar antivirals, regardless of our personal feelings.

I think that's a situation that many of us forget about. Always good to be reminded.

Best of luck.

markeys6 wrote:

The helpful advice indicating the Virus Chest of Avast as requesting elements of CMM is appreciated. Some of us who are using our Macs to access government computers via VPN are required to use Avast or similar antivirals, regardless of our personal feelings. When Avast does something that we did not suspect, the advice given on this page is very much appreciated.

There are no personal fellings involved. It is a fact that third party apps like AVAST and CMM may cause problems. There are no Mac virus' out in the wild so using AVAST is totally unnecessary, resource consuming, and problem causing.

If your organization requires installing such app then the organization needs to be looking for new up to date support contractors or staff. Even Windows users no longer install third party anti virus apps like AVAST. Current MacOS and Windows have built-in security protection that is interferred with by third party apps like AVAST.

It is a wonder your computers run. CleanMyMac, AVAST, and Norton..

Just a suggestion, not a personal attack so don't get offended, maybe read some of the thousands of posts in these forums that mention those 3 apps.

More good reading:

Effective defenses against malware and ot… - Apple Community

macOS - Security - Apple

Protect your Mac from malware - Apple Support

Well, the problem is that it is a disservice to anyone coming to these forums for help to pass out such blatant misinformation.

FYI, if you are running Catalina, the OS and system files are now "quarantined" in their own inaccessible volume (read only), so any malware/virus has no access to it. Neither would an app looking for such. So, there is no point in installing these nonsensical apps; at best, they simply use resources unnecessarily - at worst, they will mess up your system.