Unable to disable Adobe’s Global Object Security Policy

I am trying to access a PDF file from school, but I keep getting these instructions:

Adobe Reader > Preferences > JavaScript > uncheck the "Enable global object security policy" field

However, idk where the preferences section is and I can't access the chance through JavaScript. Can someone please help me?

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Legend

Preferences is on the Edit menu in Windows and the Acrobat menu on Mac.

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