Your laptop doesn't have a PDF reader installed. Your PDF reader or preferred program is out of date and needs an update. Your PDF application is potentially damaged or needs to be rebooted. The PDF is potentially damaged or tampered with.
Source : https://www.adobe.com/acrobat/hub/why-pdfs-will-not-open.html
Open File Explorer and click on File > Options in the top-left corner. If your mouse is giving you problems, you can still access File Explorer Folder Options. Press the Windows Key + E to open File Explorer.
Source : https://m.majorgeeks.com/content/page/open_folder_options.html
If the Google Chrome browser is not updating or shows a download pending, chances are it can be fixed by restarting the device a few times, installing the google play store cached data, and booting the device from safe mode.Mar 30, 2024
Source : https://www.linkedin.com/pulse/google-chrome-updating-download-pending-all-errors-solved-backdroid-ylbrc
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Source : https://www.youtube.com/watch?v=gMYvCEFmZvM
Go to Library settings > Advanced Settings, you will find the option under the Opening Documents in the Browser" section. After then
Source : https://learn.microsoft.com/en-us/answers/questions/706379/how-to-force-to-download-files-instead-opening-in
Ensure that your device has a stable internet connection. PDF files often need to be downloaded from the internet before they can be opened. Make sure you have enough storage space available on your device to download and open PDF files.
Source : https://discussions.apple.com/thread/255075729