I installed the newest version V5.43.6522 (64bit). It still does not clean. The Windows application log has this:
Fri.Faulting application name: CCleaner64.exe, version: 5.43.151.6522, time stamp: 0x5b06f9ea
Faulting module name: CCleaner64.exe, version: 5.43.151.6522, time stamp: 0x5b06f9ea
Exception code: 0x40000015
Fault offset: 0x00000000005b9f36
Faulting process id: 0x16cc
Faulting application start time: 0x01d3fe86694c1e75
Faulting application path: C:\Program Files\CCleaner\CCleaner64.exe
Faulting module path: C:\Program Files\CCleaner\CCleaner64.exe
Report Id: a7982588-6a79-11e8-b790-902b34da1143
This is on Windows 6.1(build 7601:service pack 1) .