Note: Canon occasionally removes older versions. If you need 3.5 for a specific project and cannot find it on the official portal, you may need to contact Canon Professional Support directly to request the legacy archive.
Since the official link is deprecated, follow this approach if you have legacy camera hardware: canon eos digital info sdk 3.5 download
– Current SDK versions are much newer (v13+ as of 2025). v3.5 is from ~2009 and is likely only useful for maintaining older software or specific legacy systems. Note: Canon occasionally removes older versions
: Battery level (detailed as a percentage) and device date/time. canon eos digital info sdk 3.5 download