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Sorry to hear about the trouble caused.
As the error says, "Installer quit unexpectedly," we'd suggest a couple of troubleshooting steps try:
1- Reboot your computer
2- Run this cleaner tool to remove any old traces of the application https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html
3- Use this link to download the setup for Acrobat 2020 https://helpx.adobe.com/download-install/kb/acrobat-2020-downloads.html
Let us know if this works.