Modern ZKTeco software sometimes drops support for very old fingerprint readers. If you have 20 kiosks purchased in 2010, the ZKTeco Attendance Management Software 2011 is the only software that will talk to them without firmware upgrades. It supports the legacy Push SDK protocol that newer software has deprecated.
The (primarily known as ZKTime 5.0 ) is a legacy Windows-based desktop application used to manage biometric attendance data from ZKTeco terminals. It is designed to download attendance logs, manage user information, and generate reports. Key Setup & Operation Steps zkteco attendance management software 2011