We apologize for the inconvenience caused, as per the description above, Acrobat 11 is crashing when linking to an attached PDF, Is that correct?
Please check for any pending updates of Acrobat from help>check for updates, reboot the machine after installing any updates and see if this brings any difference.
Try resetting the Acrobat's Preferences once and reboot the machine, to reset the preferences, please refer to the steps mentioned in the article How to reset Acrobat Preference settings to default.
Is it specific to one PDF file or with all the PDF files? have you tried linking any other PDF file as testing?
Uninstall Acrobat once using Acrobat cleaner tool Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs
Reboot the machine and install Acrobat back from Download Pro or Standard versions of Acrobat DC | Non-subscription
let us know how it goes, and share your findings.
I had tried all those steps prior to receiving your response. Unfortunately none solved the problem which is not limited to one file.
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Sorry for the delayed response and inconvenience caused. Is it possible to try to set a link to an attached PDF using the latest version of Acrobat Pro DC and see if this issue is reproducible? Download Pro or Standard versions of Acrobat DC | Non-subscription
As Acrobat 11 is an old software and the security updates, patches are not available and this may lead to some issues.
Let us know how it goes and share your findings.