After running this, you will never see vcredistx642008sp1x64exe not found again—for any software, for any era.
Search for (e.g., from TechPowerUp) — a single installer that includes 2005–2022. This often eliminates missing redist errors for older software.
At 2 a.m., a small victory: an archived copy of an installer found on an old developer mirror, file name intact. He downloaded it slowly, watching the progress bar like someone tracking a migrating bird. The file arrived with the weary dignity of something discovered in an attic trunk. He copied it into the installer folder and tried again.