As you can see, this is a big problem!Īny help would be really, really, really appreciated! Thanks in advance. I do a lot of work with statistical software and because I can't update my Mac there are certain functions and programmes that are starting to become unusable. <- this is the direct example of when I tried to just update it to Sierra. Reply Helpful John Galt 127,931 points 7:22 AM in response to John Galt John Galt wrote. ![]() When I say 'doesn't work', it starts installing (the window pops up) and then another window pops up saying: This version of macOS 10.12.6 cannot be installed on this computer. As you are on El Capitan and you want to go to Sierra that is called an 'upgrade' and you can only upgrade to macOS Sierra via the App Store, the version that is available at the moment is 10.12.4, which is the full installer. I have then tried manually updating from the Apple website database - doesn't work. I have also tried looking through App Store and manually updating that way - doesn't work. I have tried via the classic Software Update route but nothing comes up. I want to update it as I appreciate that El Capitan is well out-of-date and my apps (and system in general) is starting to reallllllly slow down. ![]() I currently have an iMac (20-inch, mid 2009) running on OS X El Capitan (version 10.11.6).
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