May 26

Chances are you installed a windows update to your server that caused this to occur.  There was some in April and May 2016 time frame that were released.

Completing the post installation tasks will resolve the issue:

Microsoft Warns WSUS Users About Flawed KB3148812 Update

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Jun 22

I finally found the direct link to download the WSUS Debug tool (wsusdebugtool)

You can get it from Microsoft by going here.

Here is the command to remove uneeded files

wsusdebugtool /tool:purgeunneededfiles

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