Greetings,
The Pro 9000 mkII hasn't been supported under Mac OS since v10.13 High Sierra.
If you live in the United States, you'd be eligible for Canon's upgrade program. You get a small discount and free shipping on a new product.
Other option is using the printer on a system running an earlier version of Mac OS.
~Rick
Bay Area - CA
~R5 C (1.1.2.1), ~R50v (1.1.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve Studio ~ImageClass MF644Cdw/MF656Cdw ~Pixel 10 ~CarePaks Are Worth It
