Even if you find a valid CD key, ARCP2000 itself will not run natively on Windows 10 or 11. The software relied on 16-bit installers and DOS-extenders. Modern 64-bit versions of Windows have removed NTVDM (NT Virtual DOS Machine). You would need a full Windows 98 or XP virtual machine—and a CD key won’t solve the driver issues for 3D graphics.
Call your local Mitsubishi Electric distributor. Explain that you have legacy equipment (MELDAS 500/600 series) in production. In many cases, distributors still have access to old master installation CDs. They may provide you with a licensed copy and a verified CD key (not a "top" key, but a valid site license). Fees vary from free (for long-term clients) to a nominal administrative charge ($50–$150). arcp2000 cd key top
Searching for "arcp2000 cd key top" enters a gray area. Even if you find a valid CD key,
The better ethical route: Contact the successor company. Explain you have legacy data. They often provide a one-time reader license for free to extract your old designs into a modern format like STEP, IGES, or DXF. The better ethical route: Contact the successor company