How Can you update a 32 bit to a 64 bit computer?

Here is an article that may help.

• 32-bit app compatibility with macOS High Sierra 10.13.4 and later - Apple Support
  • "Apple has been working with developers to transition their apps, and in 2018 Apple informed them that macOS Mojave would be the last version of macOS to run 32-bit apps. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS."

meschou Said:

"How Can you update a 32 bit to a 64 bit computer?: How do you update to 64 bit computer from a 32 bit? Do you have to buy a new computer?"

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It's Time to Upgrade:

No. This is not an option. And Yes: you must buy a new 64-bit computer for this.