Try these troubleshooting steps (for Windows):
- Run the Windows System File Checker tool to repair missing or corrupted system files.
- Download and install the latest Microsoft Visual C++ redistributable package (x86) on your machine (required by the TurboTax software), and then relaunch TurboTax.
- Delete the downloaded file and download TurboTax again from InstallTurboTax.com. Sometimes files get corrupted during the download process.
- Restart your computer in Selective Startup Mode, and then install TurboTax.
See this help article for more information.