Hi Hmm888:
What are the names of the processes in the installed edition of CCleaner v6.40.11562 that load at Windows startup but aren’t included in 6.39.11548, and are you certain they weren’t orphaned remnants of CCleaner v7.x? Regardless, I seem to recall that all installed versions of CCleaner v6.x create (or used to create) scheduled tasks in Windows’ Task Scheduler like CCleanerCrashReporting, CCleanerSkipAUC and/or CCleaner Update that will load files like CCleanerBugReport.exe and CCUpdate.exe into memory when executed.
Unfortunately, I can’t test myself. I run my CCleaner Portable v6.40.11562 from a removable USB stick, and the only excutable I keep after unzipping ccsetup6xx.zip is CCleaner64.exe [i.e., I delete the \x86, \x64 and \Lang subfolders that contain bloat I don’t want like CCleanerBugReport.exe, CCleanerCrashDump.exe and CCleanerDU.dll (i.e., the CCleaner Driver Updater Extension)]. That USB stick is never plugged in when I power up my computer so it is impossible for my CCleaner Portable to launch any background tasks at Windows startup, and if I manually launch CCleaner Portable v6.40.11562 the only CCleaner process shown in Task Manager is CCleaner64.exe, which unloads from memory as soon as I close the CCleaner interface.
NOTE: CCleaner Portable creates the \Setup and \LOG subfolders the first time CCleaner64.exe is run. You must keep the \Lang subfolder if you use a non-English version of CCleaner.
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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7291 * Firefox v151.0.4 * Microsoft Defender v4.18.26050.15-1.1.26050.11 * Malwarebytes Premium v5.5.7.255-157.0.5633 * HDCleaner Portable 64-Bit v2.095 * CCleaner Portable 64-bit v6.40.11562