What Is MultiUpgrade?
This is a known virus for Mac devices. MultiUpgrade supplies the system with pop-up advertisements, coupons, banners, advertisements to clog the Mac. Due to the large amount of advertising, the performance of the system is significantly deteriorating. Your privacy will be stolen by developers for personal gain. MultiUpgrade changes the system settings. You cannot undo all system changes. For example, your search engine will change the look. To protect your Mac from further infection, remove MultiUpgrade.