Here the last post of Frank-HRO » Fr 21. Dez 2018, 18:45 :
Translated to English:
"The provider has realized a move of the site to another server. Now the version check is working again."
My recommendation: Ask your provider, regarding "file_get_contents()" and/or "curl" (of files from other servers). If it is not possible to open/read files from cmsimple.org or ge-webdesign.de, the version check will fail, and you should deactivate it in your CMS Configuration, or change the provider,
Gert