Mario,

           I can't explain why Thunderbird would not support "copy link location" for this link, as it's a standard click-through link where descriptive text is presented to the user and the URL is attached to that text.

           The "naked URL" for that document is:  https://drive.google.com/uc?export=download&id=0B98uELZbPFnOMG92Z1JYMlFYX1U 
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Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

   Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

         ~ H.L. Mencken, AKA The Sage of Baltimore