Zkteco Biotime 8.5 requires activation and a valid license to function. You can obtain a license from the official Zkteco website or an authorized reseller. Follow the instructions provided with your license to activate the software.
Locate the downloaded .zip file and unzip it using WinRAR or a similar tool. Zkteco Biotime 8.5 Free Download
ZKTeco offers some free or lower-cost options: Zkteco Biotime 8