Been using Avast since 2006, if i had any PC with Ccleaner update that showed Avast in the install window there, i'd just uncheck it and go about my business, as i feel Avast provides the best protection for virus, malware, spyware, without slowing down the systems, Currently installed on 2 Desktops, and Laptop, and happy to report no issues, and yes all systems still use ccleaner
Only one it showed that on was Insider Preview system, all i did was uncheck the avast in the program, installed Ccleaner, and done
Nothing too big a deal i feel to get upset over