Apologies in advance for posting this in the public forum; I don't have access to our company account to open a ticket with Piriform.
We have been deploying / updating CCleaner via SCCM for years with the MSI-based install. The 5.44 update keeps failing with a result code of "1" (it should be "0") - which to SCCM is a fatal error. it will not retry. The package should create a log file but the log is empty.
If I run the package manually, I have a 40% chance of it installing successfully and within that 40%, I have a 0% chance of the program actually running. As others have noticed, the program opens and immediately closes. There is nothing in the Event Log to indicate an application crash or why the program closed; It just won't run.
I have tested on a "clean" install of Windows 10 (1607, 1709 and 1803) with the same result each time.