Additional function patches and service packs are located in the directory "AdditionalFunctions_41" at the same level as the installer.
For details about the additional function patches and service packs, please refer to the document in the "AdditionalFunctions_41" directory
For your information, service packs are provided in a compressed ZIP format "DSS41_SP4.zip".
To use it, please refer to the "DSS41_SP4_README_en.txt" in the unzipped folder and apply the service pack.