Many sites force you to fill out surveys or create accounts to "reveal" the product key. These are designed to harvest your email addresses, passwords, and personal details to sell to third-party advertisers or hackers.

While you cannot loop the free version automatically, running the 1080p Extreme or 4K Optimized preset 3 to 4 times back-to-back will sufficiently warm up your GPU to test for thermal throttling.

Are you troubleshooting a like crashing or overheating? Do you need this to test a new overclock profile ? What graphics card model are you currently benchmarking?

is officially free for personal use and includes the core high-stress testing features. UNIGINE Benchmarks Why the Basic (Free) Version is Sufficient