[xwiki-users] Cannot upgrade Enterprise UI Extension to 6.4.2

I am using the Extension Updater to upgrade our XWiki instance from 6.3 to 6.4.2 Whenever I try to upgrade the 'XWiki Enterprise - UI - Main Wiki All' package, I get the following error: * An extension with feature [org.xwiki.platform:xwiki-platform-appwithinminutes-ui] is already installed on root namespace ([org.xwiki.platform:xwiki-platform-appwithinminutes-ui-6.3]) class org.xwiki.extension.InstallException: Failed to resolve extension at org.xwiki.extension.job.internal.AbstractInstallPlanJob.installExtension(Abs tractInstallPlanJob.java:770) at org.xwiki.extension.job.internal.AbstractInstallPlanJob.installExtension(Abs tractInstallPlanJob.java:393) at org.xwiki.extension.job.internal.AbstractInstallPlanJob.installExtension(Abs tractInstallPlanJob.java:290) at org.xwiki.extension.job.internal.AbstractInstallPlanJob.start(AbstractInstal lPlanJob.java:220) at org.xwiki.extension.job.internal.InstallPlanJob.runInternal(InstallPlanJob.j ava:88) at org.xwiki.job.internal.AbstractJob.runInContext(AbstractJob.java:209) at org.xwiki.job.internal.AbstractJob.run(AbstractJob.java:192) I have tried to upgrade from 6.3 to 6.4.1 first and then upgrade from 6.4.1 to 6.4.2, but I still get the same issue when going from 6.4.1 to 6.4.2. Going from 6.3 to 6.4.1 works fine. Are there any workarounds to get Enterprise UI package to upgrade, or will this be something that is fixed in next release? Thank you, Charlie