Thanks for clarifying the version numbers.
YES, I do realize that it is suggested to always run the "latest" versions. From my nearly 40 years of writing and using software, I know that there is no such thing as "bug-free" software. Unless the underlying O/S has changed, the old software should work fine. As far as I know there is no software "bit-rot" unlike 'rot' in my very old car. Lot of times new software is worse than previous versions - I just watched Microsoft and their Updates over the many, many years. (and many other software releases with newly introduced problems)
As I mentioned I am running Windows 7, not Windows 10 which BTW in my opinion (Win10) is mostly full of useless app bloatware. Some of us 'older folks' do not need latest and the greatest gadgets, we are happy with just plain working programs.
But, thanks again for replying, obviously you know your CCleaner software better I do.
Regards