If you want to use Pro models in your workflow, the only reliable and safe method is through the official channels:
Create a Free Account: Sign up on the official 3dsky website. 3dsky pro account password install
Use the Official Plugin: 3dsky offers an official "3dsky Scripts" or "3dsky Library" manager for 3ds Max. This is the only "install" you should perform. If you want to use Pro models in
Purchase Credits: Buy a Pro subscription or individual model credits. 3dsky pro account password install