There are multiple things wrong with downloading pirated software (GP Premium or anything else).
1. The people who work full time to create and support the software aren’t compensated for their hard work. If everyone purchased pirated versions of the software, the software would cease to exist (and therefore not even be available to pirate).
2. You don’t receive actual support for the product. If you need help, the people who sold you the pirated version certainly won’t be there to support you.
3. You run a very high risk of installing software on your server that has malicious code added to it. Hackers use this malicious code to take over your server, at which point they can do anything they want (delete your website, steal your/your customers’ data, etc..).
In my opinion, it’s worth the $49.95 (in this case) to support the people who work full time to build the product, get excellent support and protect your website/data from hackers.