Error 501. The server does not support the functionality required for processing this request.
This action is not supported by the server. The server does not support the functionality required for processing this request. For example, your proxy server forces transmitted data to be compressed but the server on which the file is located does not support compression. Also this is typical answer if the server does not understand the method specified in the request.
Search for alternative links to the file
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URL contains errors
Check the URL. Correct the URL and try to download again.
Try to download later
Possibly the server works unreliably. Try to download the file later.
For more information on this error and the ways to correct it you can search on DM froum: