C:\temp\FHIR_Validation>java -jar org.hl7.fhir.validator.jar .\Patient.json -defn .\igpack.zip -ig hl7.fhir.us.core-1.01 -output c:/temp/FHIR_Validation/fhirValidation_json_uscore.log
  .. load FHIR from .\igpack.zip
  .. connect to tx server @ http://tx.fhir.org/r4
-tx: Connect to http://tx.fhir.org/r4
    (v3.0.1-11917)
+  .. load IG from hl7.fhir.us.core-1.01
Exception in thread "main" java.lang.Exception: Version specific package resolution not done yet
        at org.hl7.fhir.r4.validation.ValidationEngine.resolvePackage(ValidationEngine.java:526)
        at org.hl7.fhir.r4.validation.ValidationEngine.fetchByPackage(ValidationEngine.java:500)
        at org.hl7.fhir.r4.validation.ValidationEngine.loadIgSource(ValidationEngine.java:363)
        at org.hl7.fhir.r4.validation.ValidationEngine.loadIg(ValidationEngine.java:597)
        at org.hl7.fhir.r4.validation.Validator.main(Validator.java:261)