Install both the and x64 versions, even if you have a 64-bit system. Summary Checklist for Windows 7 Users: Is SHA-2 updated? (Most common fix)
Follow the on-screen prompts to "Clean All." This removes corrupted registry keys and leftover files that trick the new installer into thinking it's damaged. 2. Update Windows 7 (The SHA-2 Requirement)
(Best for "Error 16" or "Installation Failed")