I have this same problem. I just got a new iMac with Catalina and CCleaner crashes every once in a while while cleaning or analyzing. It also doesn't clean out the log files. Also, continue to get the NAG notice about Safari. I thought they had corrected that for this version. It's nuts that we can't get this stuff worked on. I'm using the free version, but it still shouldn't be crashing. I have version 1.17.603 also. I did have the pull down menu, until I did the first clean. Now it comes down but everything is grayed out and it won't let me quit.