I can’t help with pirating software, your options are going to be heavily limited because most people running Linux would just prefer open source alternatives (like Blender), so it’s far less likely you will find cracked software specifically made for Linux (plus, there is a far smaller userbase). On some quick searching, I did find someone who had issues running Houdini in a VM (for multiple distros), but it worked fine when it was installed natively. I’m not seeing an entry in the WINE database for Houdini, so while you could always try running a Windows version through WINE, given the type of program it is, I highly doubt it would run without issue. I have no recommendations on how to get ahold of a Linux compatible version without a license.
Correct, but I believe the user is looking for a cracked version, as they don’t have a license. The likelihood of that existing is significantly lower on Linux than it is for Windows given the much smaller userbase, the fragmentation into multiple package formats, and the overall distaste of proprietary software in the Linux community.