What is the legal situation of piracy in Slovenia?

More of a generic answer as I don't know the situation there, so hopefully someone local will come around and chime in.

Unfortunately we live in a world where it doesn't take much money for the movie/music industry corporations to sway the politicians in any country.

So what may be legal today, could very well not be a week, month or year from now and you'd want to stay on top of news like that.

As a general rule of thumb, I'd suggest using a solid VPN, if you're uncertain about the consequences. I switched Mullvad (would I recommend it? Sure, but only if you're ready to actually pay for it) and used to use Nordvpn (it's ok, seems to have become bloated, but sometimes with cashback deals it's essentially free) and there are plenty more out there depending on your level of comfort in quality of service they actually provide.

Now if someone can confirm what the situation is actually like, it could be anything from "I'm gonna need a n-th NAS with xxx TB capacity to seed all this" through "oh no, another email from my ISP, I need to setup a filter to send these to trash directly" to "who's that knocking on my door at this time of the day". In the end it all comes down to your appetite for risk.

It's impossible to get into trouble, unless you sell pirated content. No need for VPN.