Re Canadian charts. Afraid you are out of luck. Pretty much all chart plotter charts are proprietary and controlled by the manufacturer. Or by one of the big cartographers and have been since the turn of the century. They are all copy protected.
Your Furuno Plotter uses C-Map NT (or possibly C-Map Max) SD cards. I can’t tell from the picture as the wire is in the way but it gives the type on the SD card door below “NavNet”. You can get the charts you want from any C-Map dealer. Finding them for free isn’t going to happen but you may find a deal on eBay or second hand locally (Craigslist, Marketplace, etc).