This is how you can change IGSSUpdateService.exe in IGSS
1. Download the IGSSUpdateService for the version you need below.
2. Stop the IGSSUpdateService.exe
3. Copy the newly downloaded IGSSUpdateService.exe in to the GSS folder under the IGSS installation and overwrite it. (Administrator rights are required)
4. Start the IGSSUpdateService.
5. Run IGSS Updater and update IGSS.