While it might be tempting to look for a "crack" or "registration key" for Proxifier 5.0, downloading such files usually ends up being a cautionary tale rather than a helpful shortcut. Here is the "useful story" behind these types of downloads: The Illusion of a Free Lunch

Programs that hijack your browser settings or install "bloatware" that slows down your system.

Proxifier offers a 31-day free trial with full functionality, which is the best way to test the software safely.

If you want a free tool forever, look at Proxifier alternatives like ProxyChains (for Linux/macOS) or Supervise which offer similar tunneling capabilities without the security risks of cracked software.