can this downloaded os update be found and removed?

I unchecked the "download new updates when available" too late, and now Catalina appears to have been downloaded to my computer and I'm already really tired of being asked daily if I',m ready to restart my computer and "finish" the install. I absolutely do not want this upgrade and I'm really nervous to think of it lurking onboard, waiting for me to make a mistake. Is it possible to remove whatever was actually downloaded? Where is it it and how to I go about removing these files?