Hello,
As a suggestion, might I recommend a forum STICKY FAQ which discusses 32 bit vs 64 bit? I know you get asked questions on this regularly. In my scenario (Win 10 Pro, 64 bit, Delphi Tokyo 10.2.3, DOA 4.1.3.5), I have Delphi and Oracle 12cR2 64 bit database/client installed on the same...