regsvr32 /u C:\Windows\System32\zkemkeeper.dll
To register the component into the Windows Registry, you must use an elevated Command Prompt. Click the Windows menu. Type cmd . Right-click Command Prompt and select Run as administrator .
Example C# connection to a device:
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A mismatch between your application's target platform architecture and the registered DLL.
Ensure all 7+ companion DLL files downloaded with the SDK are copied into the exact same folder as zkemkeeper.dll before running the registration command.
Before installation, you must understand a critical architectural detail about Windows and ZKTeco SDKs: regsvr32 /u C:\Windows\System32\zkemkeeper
Ensure you have the full set of required dependency files. The registration will fail if zkemkeeper.dll cannot find its companion files in the same directory: zkemkeeper.dll commpro.dll comms.dll rscomm.dll tcpcomm.dll usbcomm.dll ploap.dll Step 2: Paste Files into the Correct System Directory
Ensure all 7+ SDK files are copied into C:\Windows\SysWOW64 . Error code 0x80040154 (Class not registered)
This error usually occurs when a 64-bit application attempts to call a 32-bit registered DLL, or vice versa. Right-click Command Prompt and select Run as administrator
3. "Class not registered" Error in Visual Studio / Application
Ensure you ran the Command Prompt as an Administrator when executing regsvr32 . If your development environment (like Visual Studio) is running as a 32-bit process, you must register the 32-bit DLL in SysWOW64 , even though your OS is 64-bit. 2. BadImageFormatException
In Visual Studio, go to Project > Add Reference > COM tab , and look for ZCOMAttendance or browse directly to the registered zkemkeeper.dll file.
Ultimate Guide: How to Install zkemkeeper.dll for 64-Bit Windows Systems