The SDK needs to updated.
Please download the sdk file from the link below, http://lenvica.in/downloads/ZK_SDK_184.108.40.206.zip
Follow the below steps:
For 32 bit systems,
1. Extract the zipped file
2. Run the 'Auto-Uninstall_sdk.bat' file
3. Run the 'Auto-install_sdk.bat'
For 64 bit systems,
1. Extract the zipped file and Copy all the files of 'sdk' folder to "C drive > windows\syswow64"
2. Open command prompt and run 'regsvr32 -u zkemkeeper.dll'
3. Then run 'regsvr32 zkemkeeper.dll'
Hope this will help!