Lots of pirated programs will get reuploaded to other places with viruses added, which is why programs and games can be one of the more risky things to pirate. That said, if you use the links in the download directory section of the db0 wiki genp guide (the one labeled latest updated version), then you should be safe. That wiki is run by the same person who runs the instance you signed up on as well as this community.

Of course, if you don’t absolutely need Photoshop then it’s infinitely less risky and less complicated to just use gimp or krita.