You might have successfully downloaded an old version, only to find it won't run. Try these fixes:
The biggest risk of using outdated software is the lack of security patches. If a vulnerability was discovered in an older version of KeyRep, developers fix it in the newest release. By running a legacy build, you leave your system exposed to potential exploits. 2. Malware and Trojan Risks
The majority of searches for target the v2.x branch—specifically v2.7 or v2.9, which are considered the "gold standard" before a controversial redesign in v3.0.