Adobe does not support third-party software, including, but not limited to, Web browsers and FTP client applications. Solution 4 Ensure that your hard disk has enough space available for the file you are downloading. To increase space, delete unnecessary files and applications, then use a disk utility to defragment the hard disk. For assistance, refer to your operating system's user guide or support resources. If you use Internet Explorer 4.0x or later, make sure that the security options in the Internet Properties utility are set to the default level for your zone.
High security can prevent files from downloading.
Exit from Internet Explorer and the Acrobat viewer. Click the Security tab. In the Web content zone section at the top of the dialog box, select the appropriate setting for the location hosting the PDF file. If the Default Level button is available, click it to specify the default security setting for this zone. If you have installed an Internet download application to enhance download performance and reliability, or if you are running firewall or proxy software on your computer, disable it, uninstall it, or contact its manufacturer to ensure that it is working as expected and is not damaged or configured incorrectly.