Hi, i don't have dual installations on one operating system. I just have two separate virtual machines (Windows 10) And, I have EN 10 installed on MacOS. Only EN 6.x legacy on Windows is working as expected. And, if I upload a pdf (with textlayer of course) within EN 10, then I see it in EN 6 as perfectly well indexed. In any EN 10 version the document cannot be found by searching on content anymore. It's just not working.
And, to answer your question: I installed EN 10 on a clean Virtual Machine.
As I said, EN 10 is not trustworthy at the moment. I must keep a EN 6 installation to at least find my stuff on index.