Replace link to user manual PDF - follow-up/fix for 7ab3a73

Author: softwareengineerprogrammer

README.rst

@@ -299,7 +299,7 @@ well drilling, surface plant, etc.) are either provided by the user or calculate
 correlations.
 
 For more information on the theoretical basis for GEOPHIRES see
-`GEOPHIRES v2.0: updated geothermal techno‐economic simulation tool (Beckers & McCabe, 2019) <References/Beckers%202019%20GEOPHIRES%20v2.pdf>`__.
+`GEOPHIRES v2.0: updated geothermal techno‐economic simulation tool (Beckers & McCabe, 2019) <https://github.com/NREL/GEOPHIRES-X/blob/fb5caadfa419c3bd05de656a33700d085fbc0432/References/GEOPHIRES%20v2.0%20User%20Manual.pdf>`__.
 
 Parameters
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