If you still want to experiment, you must look to community archives and third-party sites: Are older versions available? - Dolphin Forums
: On a 32-bit device, even these legacy versions struggle to reach playable speeds. You can expect roughly 5–10 FPS, making most games unplayable.
: Modern Dolphin requires ARMv8 (AArch64) architecture. If your device runs a 32-bit OS, it cannot utilize the 64-bit JIT (Just-In-Time) recompiler that makes Dolphin fast on newer phones. Where to Find 32-bit APKs