You can download the following module versions . or you use the SDK to build this distribution
#Tue Aug 07 02:47:25 MDT 2018
db.h2.supported=false
db.sql=classpath\://openmrs-distro.sql
name=Reference Application
omod.addresshierarchy=2.11.0
omod.adminui=1.2.3
omod.allergyui=1.8.1
omod.appframework=2.11.0
omod.appointmentscheduling=1.9.0
omod.appointmentschedulingui=1.7.0
omod.appui=1.8.0
omod.atlas=2.2
omod.atlas.type=omod
omod.calculation=1.2
omod.chartsearch=2.1.0
omod.coreapps=1.20.0-SNAPSHOT
omod.dataexchange=1.3.2
omod.emrapi=1.25.0-SNAPSHOT
omod.event=2.6.0
omod.event.groupId=org.openmrs
omod.fhir=1.13.0
omod.formentryapp=1.4.2
omod.htmlformentry=3.7.0
omod.htmlformentryui=1.7.0
omod.htmlwidgets=1.9.0
omod.idgen=4.5.0
omod.legacyui=1.4.0
omod.metadatadeploy=1.10.0
omod.metadatamapping=1.3.4
omod.metadatasharing=1.5.0
omod.owa=1.9.0
omod.providermanagement=2.10.0
omod.referenceapplication=2.8.0
omod.referencedemodata=1.4.5-SNAPSHOT
omod.referencemetadata=2.9.0-SNAPSHOT
omod.registrationapp=1.12.0
omod.registrationcore=1.8.0
omod.reporting=1.16.0
omod.reportingcompatibility=2.0.5
omod.reportingrest=1.10.0
omod.reportingui=1.6.0
omod.serialization.xstream=0.2.14
omod.serialization.xstream.type=omod
omod.uicommons=2.6.0
omod.uiframework=3.13.0
omod.uilibrary=2.0.6
omod.webservices.rest=2.22.0
owa.openmrs-owa-sysadmin=1.1
version=2.9.0-SNAPSHOT
war.openmrs=2.2.0-SNAPSHOT
With the above , you can run the reff-app on the latest core version