For a niche, high-end engineering tool like Autofluid Infinity, fully functional cracks are extremely rare. Most of the files labeled as "Autofluid Infinity crack install" are either:

The first step is to download the cracked software from a reputable source. However, we must emphasize that downloading cracked software is illegal and can pose significant risks.

There is no safe crack install. Every "free" download is a lottery where the grand prize is a backdoored PC and potential legal action.