Searching for a cracked, pirated, or otherwise unlocked "free" version of the Beckhoff Key exposes you to serious problems:
Beckhoff's licensing model is generally "pay for the runtime, engineering is free". TwinCAT Engineering (XAE): beckhoff key v2 4 free
Using such tools can result in legal liability, security breaches, and being banned from Beckhoff support networks. Searching for a cracked, pirated, or otherwise unlocked