Using cracked software is copyright infringement. Boris FX actively tracks warez releases. While they rarely sue individuals, they can legally pursue you. Worse, if you use a cracked plugin in client work, you open yourself to lawsuits from both Boris FX and your client for unlicensed commercial use.
Before downloading and installing Boris FX v10.10.577 x64-42 Free, make sure your system meets the minimum system requirements: boris fx v1010577 x6442 free