Hi, Mohd Hosni Mahmood
Thanks for reaching out to Microsoft Q&A forum.
Sorry for this unwanted experience that you're encountering. This usually isn’t a “bad Word install”, it’s Word getting stuck because macOS’s printing system (which Word uses to print and also to create PDFs) glitches after an OS update like Tahoe 26.3.
Here are some suggestions you can try:
Reset the printing system: Apple menu > System Settings > Printers & Scanners > Control-click in the printer list (or empty space) > Reset printing system, then restart your Mac and try Word again. This often brings back the Print window and fixes “could not be saved as PDF”.
Quick workaround: open the file in Word for the web (browser) and export/print to PDF from there. This bypasses the Mac printing pipeline while you’re troubleshooting.
Try one Safe Mode boot (then reboot normally): some people get a one-time privacy prompt that lets Word use an online converter for PDF, and after enabling it, PDF export starts working again.
If “Save As > PDF” fails, try File > Print > PDF (bottom-left) > Save as PDF. Sometimes that path works even when Export fails.
Hope this helps. Feel free to get back if you need further assistance.
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