So, it seems I've screwed up this release. Sorry about that. It won't be added to Wine, and I'll try again later.
Specifically, I messed up the flags on the mono-registry64 msi component, and I forgot to commit the guids for the new System.Web.Http.SelfHost msi components (which means packages built from the source tarball will have different guids, and weird things could happen to that component when upgrading from them).