Download and install Adobe Acrobat Reader in PC and you can install Adobe Acrobat Reader 18.3.2.208071 in your Windows PC and Mac OS. Adobe Acrobat Reader is developed by Adobe and listed under PRODUCTIVITY.
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If you have trouble downloading Reader after trying the steps in this TechNote, try downloading the Reader installer directly by clicking this link:. Select your operating system, language, and version, and then click Download Now.
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Follow the onscreen instructions to complete the download. To see if other users are experiencing similar download and installation problems, visit the, or the on AcrobatUsers.com. Try posting your problem on the forums for interactive troubleshooting. When posting on forums, include your operating system and product version number.
It sounds as if you're running Firefox, and as of May 4th Mozilla began automatically blocking the Reader plug-in for reading pdf files in web page windows. You should have been notified that the plug-in was being blocked. Sean's advice is right - about running in 32-bit mode - but all that seems to have come to a halt on May 4th. Go to Add-ons in the Tool menu and see if you have the 'Adobe Acrobat NPAPI Plug-in, Version 10.1.3' enabled or disabled. I am also curious as to whether you installed the latest Flash player recently as I've had trouble with Reader plug-ins after installing it. The latest version is 11.2.202.235 and you can go to see what version you're running. As an alternate for viewing pdf files in Firefox (or any other Mac browser) you can try 'PDF Browser Plugin 2.4.4' available.
Hope some of this helps - Mozilla and Adobe are apparently working on a fix.