Wish, I didn't upgrade from 2017 to 2018, but when I upgraded to 2019 from 2017, I just had the installation utility install 2019 into the same \bb directory. So my 2017 files were overwritten by the 2019 files. At least I think that's what happened. I just checked my \bb directory, and I see that, in addition to the bbw.exe file, I now have a bbw3.exe and a bbw4.exe, in addition to the bbw64.exe. Not sure what the -3 and -4 executables are for. But when I click on the old 2017 icon to boot the program, 2019 comes up, cuz the shortcut icon is just set up to load bbw.exe. So as far as I can tell, 2017 is gone from my machine. So I guess what I'm saying is that, if you were to install 2019 into your \bb directory, this would automatically take care of deleting 2018 from your machine. Assuming, of course, you went with the default installation when you installed 2018.