Change error message on Windows

helics/_build.py

@@ -49,10 +49,19 @@
 if platform.system() == "Windows":
     for file in os.listdir(os.path.join(PYHELICS_INSTALL, "bin")):
         if "helicsSharedLib" in file:
-            lib = ffi.dlopen(os.path.join(PYHELICS_INSTALL, "bin", file))
-            break
+            try:
+                lib = ffi.dlopen(os.path.join(PYHELICS_INSTALL, "bin", file))
+                break
+            except OSError as _:
+                pass
     else:
-        lib = ffi.dlopen("helicsShared.dll")
+        try:
+            lib = ffi.dlopen("helicsShared.dll")
+        except OSError as e:
+            raise OSError(
+                str(e)
+                + "\n\nRECOMMENDATION: When using Python / Anaconda on Windows, users must manually install the latest version of Visual C++ Redistributable for Visual Studio 2019. See https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads for links. If this problem persists after installing Visual C++ Redistributable, please open an issue on https://github.com/GMLC-TDC/HELICS."
+            )
         if lib is None:
             raise Exception("Unable to load helics shared library")
 elif platform.system() == "Darwin":