[Is there a problem with CCleaner on Mac Big Sur (OS 11.0.1)?]

8 hours ago, Dave CCleaner said:

Are you able to provide any other information regarding your system configuration so that we can try to replicate your issue.  Are you on a Mac using the new M1 chip?  And specific firewall, AV or other system utilities that you are using?

Sure.
I'm running it on a MacBook Pro 15" 2017, 3.1GHz Intel, 16GB RAM with latest BigSur (11.2.3).
I use LuLu firewall and no AV. It still won't open with the firewall disabled.

I can provide all info you need, just tell me what to look for. Maybe some logs.
Here is the macOS problem report: https://pastebin.com/h0GtP0dv

I asked a friend to test it too as he has a pretty stock macOS installation. I'll update with his results.

[Is there a problem with CCleaner on Mac Big Sur (OS 11.0.1)?]

Yeah. It looks like it is universally broken for everyone with Big Sur. It does not even open, It's a major bug.

[Is there a problem with CCleaner on Mac Big Sur (OS 11.0.1)?]

@Dave CCleaner Yes, I'm still having the exact same issue running Big Sur 11.2.1 and CCMac 1.18.30.
It won't even open, it just shows a very similar error report as timfea926's.