If you don't have a valid license key or product key, you may need to use a crack or activator to bypass the activation process. Using cracks or activators may pose security risks and violate software licensing agreements.
Autodesk sugiere este método como la única solución garantizada si necesitas usar esta versión específica. como instalar autocad 2004 en windows 10 64 bits link
No instales desde un CD virtual o unidad física. Copia toda la carpeta de instalación a tu disco duro (ej. C:\Autocad2004 ). If you don't have a valid license key
: Copy the entire contents of your AutoCAD 2004 installation CD to a new folder on your hard drive (e.g., C:\AutoCAD2004_Setup ). Compatibility Settings : Find setup.exe in the folder you just created. Right-click setup.exe and select Properties . Navigate to the Compatibility tab. No instales desde un CD virtual o unidad física
This is the simplest manual method to bypass basic installer blocks.
Use VirtualBox with Windows XP SP3. It’s free, safe, and keeps AutoCAD 2004 isolated from your main system.