I ran Ccleaner free - which had been running perfect until today - this morning in Windows 10 64-bit home edition and it (not sure the technical term) crashed/disappeared/terminated early with no error. It ran and appeared to remove files as it should, but after clearing Google Chrome cache it abruptly exited. The Ccleaner interface/dashboard window disappeared and shut itself down.
Troubleshooting
Here is what I tried to fix it, to no avail:
Updated to the latest version and re-ran.
Ran in safe mode.
I went into Safe Mode to do troubleshooting, but it just did the exact same thing.
System
Microsoft Windows 10 Home (10.0.17763 Build 17763)
Belarc Advisor reports OS as: Windows 10 Home (x64) Version 1809 (build 17763.253)
Ccleaner Free v. 5.52.6967 (64-bit)