You can find the official user manual for this version on the ZKTeco Global Download Center or specialized support sites like domofonov.net . ZKTime5.0 - Download
Even the most stable builds have quirks. Here are three specific to ver 4.8.7 Build153: Zktime5.0 Attendance Management System-ver 4.8.7 Build153
Example: Using week-over-week trend analysis, HR identifies three roles with growing unplanned absences and investigates root causes (workload, management issues), reducing churn through targeted changes. You can find the official user manual for