Error 1712 during Office 365 installation usually means the installer is unable to access or modify necessary setup files—often because remnants of a previous Office version are still present or full system permissions aren’t granted. Here’s a clean, streamlined fix:
- Completely remove old Office installations: Use Microsoft’s Support and Recovery Assistant or the manual uninstall tool to ensure no leftover files or registry entries remain.
- Clean temporary files and cache: Clear your Temp folder and delete any “Office” or “MSOCache” folders that may hold corrupted data.
- Re-register Windows Installer service: Open an elevated Command Prompt, run
msiexec /unregisterfollowed bymsiexec /regserverto reset the installer engine. - Run the Office setup as administrator: Right‑click the Office installer and choose “Run as administrator” to avoid access restrictions.
- Disable antivirus or firewall temporarily: Security tools can lock installation files—turn them off until Office finishes installing.
For a full, step‑by‑step walkthrough—including registry cleanups and advanced tips—visit this detailed guide.