I'm with you on using an older (safer) version of CCleaner after the new owners were proved not to be trusted in the same way that Piriform were.
I've played around with a few older versions recently, nothing too scientific, but found that different versions in the v5.30-5.36 range produced varying results with the same settings. v5.36 missed lots of browser temporary files that other versions cleaned up. I'm wondering if CCleaner wasn't as good as many of us thought for some time. I'm currently using v5.30 alongside occasional sweeps with Bleachbit and Wise Care 365, they all clean some data that the others miss.