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Fix Solver Installation Errors Caused by 32-bit/64-bit Mismatch

This article explains how to troubleshoot installation errors that arise from 32-bit vs 64-bit mismatches when installing Solver and related .exe installers.

Summary

  • Installation errors can occur when the bitness of Excel and the installer do not match, or when remnants of a previous 32-bit Office installation remain. Use the correct 32-bit or 64-bit installer and verify your Excel bitness before installing.

Check Excel bitness

  • Confirm whether your Excel is 32-bit or 64-bit before downloading or running an installer.
  • Use the installer that matches your Excel bitness (32-bit installer for 32-bit Excel, 64-bit installer for 64-bit Excel).

Why mismatches cause errors

  • If you upgraded Excel from 32-bit to 64-bit, leftover 32-bit components ("32-bit breadcrumbs") can remain on the system. Web installers may detect those remnants and produce errors during installation.

Use the standalone installer that matches your bitness

  • Obtain the correct installer (32-bit or 64-bit) and run that .exe directly:
    • 32-bit installer: https://www.dropbox.com/scl/fi/rqnjr9dkcs78macxjhvc7/SolverSetup32.exe?rlkey=4x7vsntoyrtf0uavq5kcp8g6k&dl=1
    • 64-bit installer: https://www.dropbox.com/scl/fi/hf16ua5bcuwgtofkvonlb/SolverSetup64.exe?rlkey=sb46jz5ktt2vcfq994fbo7db7&dl=1
  • These installers are available from the vendor’s provided download locations (for example, OneDrive or Dropbox links supplied by the vendor). Download the appropriate .exe and run it after confirming Excel bitness.

Troubleshooting steps (concise)

  1. Verify Excel is 32-bit or 64-bit.
  2. Download the corresponding installer (.exe) for that bitness.
  3. Run the downloaded installer directly rather than using a web installer that may detect leftover components.
  4. If you recently upgraded Office from 32-bit to 64-bit and see errors mentioning 64-bit, ensure you are using the 64-bit installer and that no old 32-bit components remain.

Conclusion

  • Matching the installer bitness to your installed Excel bitness and using the appropriate standalone .exe installer resolves common installation errors caused by 32-bit/64-bit mismatches.