Try WinMerge or Meld for open-source power.
While repacked license keys may seem like an attractive option, there are alternative solutions that can provide you with a valid license key or a free alternative to Beyond Compare 5.
that claim to offer "repacks" or "license keys" for version 5, using these presents significant security and legal risks. The Risks of "Repacks" and Unofficial Keys Security Hazards
If you're unable to obtain a Beyond Compare 5 license key or prefer to use open-source alternatives, consider the following options:
: Software repacked with cracks or illegal license keys can pose significant risks, including malware. It's safer and more reliable to use software in its official form.