I'm still stuck here, but with a new error message.
Unfortunately, I can't go further than this and don't know what to do to fix it.

I hope this error message lights some part of the path to the solution:

"Unable to find the entry point for the SetProcessDpiAwarenessContext procedure in the dynamic link library D:\Steam\steamapps\common\FINAL FANTASY XIV Online\game\ffxiv_dx11.exe."

Thank you for the attention.