InvalidDistributionRootException when executing apply-updates.sh in BRMS/BPMS for WebSphere

Issue

• I get InvalidDistributionRootException when I run apply-updates.sh to update from BPMS 6.1.0 to 6.1.5 for WAS 8

$ ./apply-updates.sh /opt/IBM/WebSphere was8

16:43:21.842 [main] ERROR o.j.b.p.client.ClientPatcherApp - Error occurred during the execution!
org.jboss.brmsbpmsuite.patching.client.InvalidDistributionRootException: Distribution root /opt/IBM/WebSphere is not valid for the specified distribution type! Please double-check that (1) the specified directory or file exists and (2) it matches the specified distribution type.
    at org.jboss.brmsbpmsuite.patching.client.AbstractPatcher.checkDistro(AbstractPatcher.java:56) ~[client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]
    at org.jboss.brmsbpmsuite.patching.client.ClientPatcherRunner.runPatcher(ClientPatcherRunner.java:42) ~[client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]
    at org.jboss.brmsbpmsuite.patching.client.ClientPatcherRunner.runPatcher(ClientPatcherRunner.java:35) ~[client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]
    at org.jboss.brmsbpmsuite.patching.client.ClientPatcherRunner.run(ClientPatcherRunner.java:31) ~[client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]
    at org.jboss.brmsbpmsuite.patching.client.ClientPatcherApp.commonMain(ClientPatcherApp.java:48) ~[client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]
    at org.jboss.brmsbpmsuite.patching.client.BPMSuiteClientPatcherApp.main(BPMSuiteClientPatcherApp.java:6) [client-patcher-6.1.5.GA-redhat-1.jar:6.1.5.GA-redhat-1]