While "Beckhoff Key V2.4" likely refers to a licensing serial for , Beckhoff does not officially provide permanent keys for free. For evaluation, you can enter "Demo" as the license key during installation to activate a 30-day trial with full functionality.
For users seeking free alternatives to TwinCAT 2, platforms like OpenPLC or CODESYS are recommended as legal, open-source options for automation. TwinCAT | Automation software | Beckhoff USA beckhoff key v2 4 free