It appears that the extension is no longer available with 2022R2. Please refer to the usage documentation:
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/add_ag/add_ag_intro.html
This is now done with the LPBF Wizard.
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/add_ag/add_ag_workflow_with_wizard.html
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/mech_addon/lpbf_mech_addon.html