Avoid generic “free download” websites. Instead, go to established printer repair communities:
: Optimized for G-series (G1000, G2000, G3000) and MG-series (MG3500, MG3600) printers. The "Service Mode" Hurdle
Because this is official technician software, it isn't listed on standard consumer download pages. You can find "high quality" versions on community-vetted platforms:
If you are trying to resolve maintenance errors like a full waste ink counter, Canon recommends the following: Maintenance Tool
The Canon Service Tool V4718 offers a range of features, including: