Okay, see it after a reload.
And I’m able to start the Download for TinyMCE alone (and not the others in the list).
But: The "Downloading" window remains open, the animated dots are running, but it doesn’t come to an end.
Finally I manually downloaded TinyMCE from the
extras page to my [tt]core/packages[/tt] directory. So at least I could use your Package Manager reloaded to find it by a locally search, add it to the package list and install it successfully.
So whatever went wrong before: Thank you, lossendae!
ottogal