So I guess Apple just broke the App Store's updates tab on 10.11 – 10.13?

[innovaTutor]

That's awesome that some engineer finally fixed that missing CSS on the Mac App Store for macOS High Sierra 10.13.6

But now we have an even worse poblem with MAS!
Mac App Store Purchased tab is offline

 

[MultiFinder17]

Luckily it seems to be working again