How often have you had to install Sitecore support dll and wondered where on earth do I download it from? I know I have.
My good friend and MVP Ian Graham did a pretty good job at answering this question on Sitecore.StackExchange back in November 2016, excerpt included for reference:
You can try searching for it here:
The dll will have a reference number associated with it Sitecore.Support.xxxxx.dll.
For example: https://kb.sitecore.net/SearchResults#term=442487
If you can’t find it just raise a ticket with Sitecore and they will provide you with the dll.
Also recently released is this Github project containing source code for support fixes
Yes, you can search and download support dll’s from https://kb.sitecore.net but only if the support patch has been written up and article relating to it exists on the KB.
If you can find it on the KB then you will be provided with a link to the dll and any supporting config which you can easily download.
What about https://github.com/SitecoreSupport?
If you have recently tried to access a support dll on https://github.com/SitecoreSupport, using a path you were previously given by Sitecore Support you will receive a 404 error.
Why? I asked the question recently on Slack and Rob Earlam, Technical Evangelist @ Sitecore answered: “We don’t have Support DLL’s on GitHub anymore, if you need a specific fix then you’ll need to open a Support ticket yourself and make the request there.”
So, there you have it – if you cannot find the Support patch publicly available on Sitecore’s KB you need to raise a support ticket requesting the support patch. Any other method of accessing a support dll is most likely an Urban Legend!!
Neil Killen 
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