Pirate it like everyone else. Why do you think maya is free? It's because they want people to learn it so they can charge studios a fuckton of money for the licenses.
Look at every rapper in the world. You think those broke fucks have a legit copy of FL Studio? Fuck no.
You think most editors have a legit copy of Final Cut or Premiere? Fuck no. I've been on sets with editors who still run illegal shit.
You just don't go around boasting about it and of course it's only a matter of time before someone gets busted but it's common knowledge most software is pirated in order for someone to gain knowledge at the beginning. Just, when it comes time to pay your dues, be sure to get a legit copy.
Plus, it's going to take a long time before you get good at anything 3D, you're probably gonna suck for like 7 years. It's a shitty struggle. But it's more reason to pirate. Who knows how long you will last. I guarantee that at some point, you will burn the fuck out and hate 3D. But if it's your passion, you will come back to it.
My point is, you might hate doing 3D after a while and on top of that, you are 800 bucks in the hole. Why risk that? And since you are an indie dev, I hate to say this but absolutely noone gives a shit about your work until they see it. Not only do you have to do everything yourself from the modeling, to animation, to programming. You're looking at decades worth of practice. Yeah, that's right man. over 10 years worth of hard work. This is not an easy field you can just watch a couple of tutorials on and dive in. This shit is true dedication.
And the harsh reality is that even after all that time and effort, by the time you do get anywhere. Most of the jobs will be outsourced. 3D is just like every industry eventually. It all goes towards those who can make a cheaper profit from art farms.
stop being a little bitch and pirate zbrush. By the time you get anywhere, there's going to be newer versions anyways. I'm running 4R6. It's fine.