As one Luddite to another my answer will likely be incomplete or even completely wrong. But I didn't want you to think you were out there just screaming into the void.

. In my limited experience with a Microsoft Word install on my computers, once it is installed you don't have to sign in to open the program. There may be steps with the newer versions of the program Office 365 which may be a subscription service. I've not used them. So I can't answer that question.
For those of you who may know the answer and viewed the post and said to themselves. "This doesn't have anything to do with flutes, whistles, or pipes et al, if you have an easy answer toss it out there.
If the mod doesn't like the thread it will get taken down. No harm, no foul.
Good luck!