they used to only put macOS in the app store, now its showing as an upgrade in software upgrade, and the red number 1 is showing in system preferences, so they kind of are forcing you really...
Thats not Apples fault but the App vendors fault, they have known for years 32bit app support would end. Apple have made it easy in xcode to move to 64bit. So dont blame Catalina blame the software vendor, if it wasnt for companies like Apple pushing forward and removing old tech we would all still have VGA ports and CD drives.
You should be able to trick it by right mouse click the app and select "open" from the dialog.I am not talking about 32bit apps, I get that. I am talking about 64bit apps, that should work, but cannot be verified by Apple. I do not give a monkey about that; if I want to install an app that should work (64bit), give me the option to do so, without having me going into terminal with a command which was extremely hard to find.
I do not want Apple to hold my hand, at least not on my Mac. This is a new thing on Catalina, unannounced, and awful!
You should be able to trick it by right mouse click the app and select "open" from the dialog.
Good luck to all you Catalina beta-testers out there (i.e. those of you who upgraded). I'm not touching this until at least 10.15.3. Catalina was such a disaster even through the real beta testing cycle. If Apple still pride themselves on quality (and make no mistake, their quality control has steadily been going down over the years) then they should change to releasing something when it's ready and not just because it's e.g. September.
Good luck to all you Catalina beta testers. I'm not touching this until 10.17 comes out. I always go 2 software updates behind because I want 6 sigma reliability in my software. I expect zero bugs and absolute perfection. /s