Using Mac OSX 10.9.5 and cannot open ANY PDF files at all

[rachelc85104025]

I reintalled Acrobat Reader DC but usually I can directly open files, at the moment I cannot.

Any help regarding this is much appreciated

[try67 · Accepted solution]

Reader DC is not compatible with your old OS version. Use Reader 11.0.10.

You can get the installer from here: https://get.adobe.com/reader/otherversions/

[assause]

Since macOS 10.12 and below are no longer supported by Apple itself, it is best to upgrade the OS.