If you are an authorized technician or dealer, you can download SST V4 directly from the official Canon dealer portal: Log into your regional . Navigate to the Technical Support or Downloads section.
If you need software for legitimate purposes, such as servicing a device you own or are authorized to service, I recommend: Free Download Canon Service Support Tool Sst Software V4
Even with legitimate software, you will hit roadblocks. If you are an authorized technician or dealer,
The firmware file is corrupted. Delete the file and re-download it from the official Canon portal. I recommend: Even with legitimate software