I'm trying to install an ir-Adv C5860i on my iMac running Yosemite 10.10.5, but whenever I launch the pkg for the driver installation I get an error "Cannot install on this version of the operating system you are using." despite the driver saying it's supported on 10.10.5 on the website.
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Never found a solution to this, but as a work around I installed the driver on a MacBook Pro running BigSur and shared it with Bonjous - We're only using the old Yosemite macs until we complete the MacBook pro rollout so it's an acceptable work around just telling the Yosemite users to make sure the laptop is online when they need to print.