R3/R4 conversion

I am trying to convert a JSON file in STU 3 form to R4 form .I have tried using FHIR Validator following this page https://wiki.hl7.org/Using_the_FHIR_Validator_to_transform_content
but when I run the command it gives the following error:

  • … load IG from hl7.fhir.transforms.v4v3
    Exception in thread “main” org.hl7.fhir.exceptions.FHIRException: Unable to resolve the package ‘hl7.fhir.transforms.v4v3’
    at org.hl7.fhir.utilities.cache.PackageCacheManager.loadPackage(PackageCacheManager.java:674)
    at org.hl7.fhir.r5.validation.ValidationEngine.resolvePackage(ValidationEngine.java:631)
    at org.hl7.fhir.r5.validation.ValidationEngine.fetchByPackage(ValidationEngine.java:620)