WordPress decided, without my permission, to install version 5.1, complete with their new but deeply unpopular “Gutenberg” editor that nobody either wanted nor requested. I can’t downgrade from 5.1, but I’ve managed to get rid of the useless Gutenberg editor. Let me know if there are any funnies.
Try to dowmload the old version
https://www.google.de/search?ei=NLWAXK_PEMrLwAKntr3IDQ&q=wordpress+5.1+download&oq=Wordpress+5.1&gs_l=psy-ab.1.5.0l10.42771.48561..56490…0.0..0.301.561.4j3-1……0….2j1..gws-wiz…….0i67j0i131.kWFA2DdQACQ
Sorry, my last email contains an error.
But you find a solution may be for your problem here:
“WordPress bietet Nutzern, die sich partout nicht vom klassischen Editor trennen können oder wollen, das Plug-in “Classic Editor” an. Es stellt “den bisherigen WordPress-Editor und dessen Bearbeiten-Modus wieder her.” Den klassischen Editor will WordPress bis 2021 unterstützen.”
https://www.heise.de/newsticker/meldung/WordPress-5-0-mit-umstrittenem-Gutenberg-Editor-4244325.html
I don’t think one can go backwards with the software. I have installed the “Classic Editor” 🙂