I just found out that 2.04 doesn't work for Multisites. You might wanna consider telling that to users before update it. That way, they won't have to
- Go through the upgrade process,
- Manually check through all the sub-sites,
- Find out that the private sites are exposed to the rest of the world
- Find out that MU sites are not supported in this release
- Revert to 1.3
- Step 1 & Step 2 again
That's what happened to me..