Canon clearly states that this device is retired and they are no longer supporting it. There are no drivers for it. However… when it is networked (wired/wireless with no USB cable connected), it is supported by Apple's built-in AirPrint for scan (using Image Capture) and printing. No Canon software is required.
Once you have it powered up and on your local network, visit Settings : Printers & Scanners. If the MG8220 is shown in Printers, click on it and choose Remove Printer from the subsequent panel. Next, click the Add Printer, Scanner, or Fax button. A new window will appear. If not already selected with the MG8220 shown, click the first toolbar button with a printer icon.
By now, you should have a line item for your printer discovered on the network. When you click that printer entry, the Use: selector will switch from Auto-Select to your printer name. Click the Add button. This will result in a new entry under Printers. Right-click on that and set it to the default printer. Print something.
I don't have a multi-function device, just a laser printer, so not certain if you click that Add Printer button again to add your scanner, or if it will be autodetected for you. At any rate, launch Apple's Image Capture from the /Applications folder and see if it detects the scanner.
When selecting a new multi-function device, confirm it is supported by Apple's AirPrint before purchase, and secondarily that VueScan Professional supports it without vendor drivers. That doubles your autonomy.