Finding a digital copy of Evil Dead: Regeneration can be tricky because it is "abandonware." It is not currently available on major storefronts like Steam or GOG due to licensing expires.
Physical Media: The most reliable way is finding a used CD-ROM copy on eBay or Amazon.
OS: Windows XP, 7, 10, or 11 (Compatibility mode may be required) Processor: Pentium 4 or Athlon XP equivalent