"Microsoft SharePoint designer does not support editing non-SharePoint sites" - while trying to open a SharePoint 2016 site with SharePoint designer 2013, got this error message.
- Simply close all instances of your SharePoint Designer and then reopen it.
- Check if client integration is enabled https://support.microsoft.com/en-us/kb/981223
- Clear SharePoint designer cache. Here is How to Clear SharePoint Designer Cache
- Try re-installing SharePoint designer!
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