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Hi @다영28745912ceax 

Sorry for the delay in response.

As mentioned above, you haven't been able to open the file in Acrobat. Is there any error message that appears while opening the file?

• Please confirm the exact version of Acrobat and how you open the .pdf file in it.
• Make sure you have the Acrobat up-to-date. 
• Go to Acrobat> Help > Check for updates and reboot the computer once (you must save all the work before restarting)

To download the patch manually, more information about this release is here: Release Notes | Adobe Acrobat, Reader 

Try opening another file, as it could be the file-specific issue.

Please share more details  to understand the issue better.

Thanks,

Akanchha