A family of Microsoft word processing software products for creating web, email, and print documents.
I believe the 13th <mc:AlternateContent> tag had no close. I manually added the closing tag and was able to open the document without further repair.
A copy of the repaired .DOCX can be found here:
I heartily recommend that you seriously proofread this repaired copy for lost content before submitting to your client or boss.
Now... where's my margarita?