Ccleaner for mac os sierra free download

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How to upgrade to macOS High Sierra - Apple Support (My mac is/ was capable of running High Sierra) I am doing this on a mac with macOS Mojave 10.14.6 installed. If that is not the case then I probably do the same a you. Apple does not take into consideration that you want to download the installer and then install it on another older compatible mac. The reason I ask is that any mac that came preinstalled with a newer OS than High Sierra will not be allowed to download High Sierra or any older OS.

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Mike you are trying to download High Sierra to your MacBook Pro, did this MacBook Pro come preinstalled with Mojave or Catalina.

 

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