Proceed with extreme caution. Use an air-gapped machine running Windows XP or 2000. Verify checksums. Disable autoplay and network adapters.
If you need legacy software that the code calculator was designed to unlock, consider: users choice code calc di phil adams e carl bulger repack
If you stumble upon a file named Users_Choice_Code_Calc_DI_Phil_Adams_E_Carl_Bulger_Repack.rar , here are red flags for tampering: Proceed with extreme caution