There are two downloads, 32-bit (aarch32) and 64-bit (aarch64). The 64-bit runtime has higher performance, but only works with newer devices with 64-bit CPU. The 32-bit runtime has lower performance, and only supports a maximum of about ~768MB of allocated RAM, but will work with all older devices. If you have a modern phone, try the 64-bit one first, and if it doesn't work use 32-bit.
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