I have just bought Lightroom 4 on CD and also downloaded it from Adobe. In both cases when I try to install the software on my imac I get the same error message. (com.apple.installer.page controller error -1.) I have no idea what this means. I am assuming it is a problem with the mac but cannot get any help from apple (as usual). Can anyone here help?
Thanks for the replies. My imac is older (about 5 years old) but I recently updated it with Snow Leopard, and then reinstalled Snow Leopard when I started having these problems (The computer refuses to recognise my Canon D5 III via EOS Utlities). I tried Geoff The Kiwi's suggestion of downloading the free trial from the Adobe website and then adding my serial number, but the same thing happens. It lets me download, but comes up with the same error message and does nothing.
I don't know how to check for compatibility issues, but accept that it may be the problem.
Finally got some help from Apple and updated the Snow Leopard to 10.6.8. Lightroom loaded straight up and now I can start the learning process. My initial reaction is that this is everything I always wanted all the other photo editing programmes to do. So I am pretty excited right now. It only took 2 days.
Thanks again for the help.
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