The file has changed error message.

Downloaded Adobe Acrobat to new computer with Windows 11.  It's saved as an adobe acrobat document.  I get the error message the document enabled extended features.  It has been changed since it was created and the use of extended features is no longer available.  Contact the author.  What do I do?  I am the only person receiving this file who has this error.  When I open the file in Adobe Acrobat it does have (64-bit) up at the top.  Please help!