A very quick post that hopefully other people find useful. I have an Adobe Creative Cloud subscription and noticed today that I could download Adobe Acrobat DC.
I've wanted to try out the new document signing features and a few other bells and whistles, so I clicked Upgrade and waited somewhat impatiently, only to be told that the update had failed.
I dug into the problem a little and was told that the installer couldn't access:
Note that your directory name will likely be different
I opened up this file in my handy text editor (I use Atom - you should too!) and found that the closing
</PayloadInfo> XML tag was malformed.
A quick correction to the file saw the installation proceed without a hitch.
I hope this helps, if you've had similar trouble.