You end up with a permanent small water mark on the bottom right-hand side of the screen as a reminder to activate. Currently, you can keep it like this indefinitely.
There are tricks to make the watermark invisible without activating Windows. It works just fine if Windows 10 is not your primary operating system and you don't plan to personalize your operating system after fiddling around a bit just after you get it installed. You can personalize it for about a couple months before the activating logo shows up; at least that's how I always experienced it.
Syncthing and Spotdl. Syncthing can sync folders over a network. Spotdl can download content from a playlist; it is multi-threaded and skips already existing or duplicate songs. It took me 20 minutes to automate everything. Syncthing and Spotdl start on startup and do their thing every 10 minutes.