For specific older builds like 4.8.8, users often refer to regional support pages or the ZKTeco UpdateStar portal.
At least 100GB of available space on an NTFS partition. Downloading and Installation Zkteco Attendance Management Version 4.8.8 Download - Google
Some antivirus programs flag the device communication drivers ( .dll files) as false positives. Disable real-time protection just for the installation duration, then re-enable it. For specific older builds like 4