or possibly an issue with the download.
In any case if I leave RM open and idle for any period of time (say to have lunch) it will start consuming large amounts of CPU, basically locking up the machine (and I have an I7 MacBook Pro). The only way out is to Force Quit. I also see the same effect after a long work session, but it seems to happen most often when I go away from the machine and come back without closing RM.
I've followed the full deinstall and install process (a couple times) but in subsequent (after the first) installations I downloaded from the normal Mac download page assuming you'd put the wrapper in the standard package. I'm not on Catalina, but wanted the new wrapper to clear up issues with TreeShare (which it seems to have fixed a couple bu not all).