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I have searched the forum here and, as expected, many people have had this problem, but few actual solutions have been given other than those for complete newbies (download file; open in Reader...)

I could open this file in the past but now it's failing.  I tried Reader DC (most current version) and when that didn't work I downloaded the trial version of Acrobat Pro but that just displays the same message.  I looked at the PDF metadata and can see it was created in LiveCycle Designer 8.0.

File Permissions : rwxrwxrwx
File Type : PDF
File Type Extension : pdf
MIME Type : application/pdf
PDF Version : 1.7
Linearized : No
Tagged PDF : Yes

Modify Date : 2020:11:24 17:25:21-05:00
Format : application/pdf
Title : Familiarization Flight Form
Producer : Adobe LiveCycle Designer 8.0; modified using iText® 5.3.3 ©2000-2012 1T3XT BVBA (AGPL-version)
Creator Tool : Adobe LiveCycle Designer 8.0
Has XFA : No
Page Count : 1

Page size: 612 x 792 pts (letter)
Page rot: 0
File size: 692592 bytes
Optimized: no

Suspects: no
Form: AcroForm