If we haven’t ‘updated’ in months is the program safe?
Probably. If you want to avoid running the program, just download the latest version and install it on top of the old one.
If you don't want to do that, and you can locate the program file "ccleaner.exe" in the CCleaner folder in C:\Program Files or C:\Program Files (x86), right click the ccleaner.exe file and left click Properties. The product version number of the program is listed under "Details." If that number is not 5.33.6162, you're OK.