0x01 A | Critical Installation File Is Missing [patched]

How to Fix the "0x01: A Critical Installation File is Missing" Error

• Remove files from %TEMP%, restart, and retry.

Restart the Windows Installer Service: A stalled installer service can cause file-access errors. 0x01 a critical installation file is missing

Install prerequisites

The TL;DR Fix:

Disable security tools temporarily

Re-download and verify integrity