IIRC the first release was supposed to be early June. Have not checked. No tutorial yet, maybe I should write one. But you can basically follow ANY OnlyOffice install procedure talking about Docker image, and replace the onlyoffice with euro-office, and it should just work.

github.com/Euro-Office/DocumentServer -> Run this to get the server going.

github.com/Euro-Office/eurooffice-nextcloud -> Run this to install it into Nextcloud.