If the official EOS Performance site is down, check: https://www.efisource.com/support/eos-downloads (EOS is sometimes rebranded by EFI Source)
If you are looking to to its original factory settings or reinstall/reset the EOS Utility software on your computer, follow the steps below. 1. Resetting Canon EOS Camera Settings reset eos efi software link download
For certified technicians, EFI maintains an FTP server at ftp.efi.com . To access the EOS folder, you need a specific username/password that changes quarterly. This is for end-users, but if you have an in-house engineer with certification, they can request access. If the official EOS Performance site is down,