It seemed that Server.app was interfering with the 10.13.4 update. It would complain that the Server Update required 10.13.4 but offer to install the previous version. Clicking OK for that, but nothing happened and 10.13.4 did not download. Then the update panel stopped populating; it would briefly show the connection spinner, then go completely blank.
A web search showed lots of people having this blank updates problem back in 2013, and at least one person solved it by deleting and reinstalling Server.
I deleted Server, but the reinstall attempt gave me the same previous version offer, but again, clicking OK, nothing downloaded. So I tried hiding it from Purchased. Noticed that Purchased wants me to "accept" GarageBand, Pages, Numbers, Keynote, & iMovie. I clicked Accept, but every time I go to Purchased, it still wants that. Updates is still blank.
Logging out of App Store and back in didn't help. Reboot didn't help. Down loading and installing the Combo update didn't help.
The Manage page won't let me unhide Server.
Trying to re-install Server, they want me to pay for it again!
Searching for an associated plist finds dozens whose names suggest they have something to do with App store. Don't want to delete that many.
Any ideas? I sent a complaint similar to this to the App Store support, but I'm not holding my breath for an answer.
In case anyone gets confused by all that, here are four things wrong:
- Updates is blank (it should show Xcode not yet updated and all the “recently updated” items.
- “Unhide” does nothing
- “Accept” does nothing
- Wants me to pay again for Server (4) is minor because I have backups, but (1) & (2) will prevent updating it.