Downgraded from Pro - Free won't work

Hi,
I downgraded one PC from PRO to FREE version of DraftSight. After installation however the DraftSight tells my my subscription is expired and directs my to renew it. I've tried cleaning softwares, and removed registery keys pointing to DraftSight and SolidWorks (SWActivation) and removed the DraftSight/SolidWorks AppData and ProgramData folders. Any help?