You can legally buy a used, physical copy of ARCP2000. Look for listings that include:
Warning: Many sellers will sell just the disc without the key. Insist on a photograph of the CD key sticker before purchasing.
Some websites list long text files claiming to contain valid CD keys. For a niche product like ARCP2000, these lists are almost always: arcp2000 cd key
Websites offering "keygens" or "cracks" for ARCP2000. These files are almost universally 20+ years old. In the modern security landscape, downloading a cracked .exe from 2004 is like drinking expired milk from a dumpster.
If you genuinely need ARCP2000 for a legitimate project, here is the ethical (and safer) approach. You can legally buy a used, physical copy of ARCP2000
You don't need a cracked key. You need free software.
"arcp2000" is a very common search query for ArcPad, the mobile mapping and field GIS software by Esri. Warning: Many sellers will sell just the disc
Stop searching for the ghost. Here is what you should actually do.