I am installing Lightroom 6 on a late 2012 iMac 27" running OS X Yosemite v. 10.10.3. The computer has 24 mb RAM. The installation aborts and a window pops up saying "Installation Failed Your installation encountered errors. Inconsistency in the installer database. Please start your computer and install again. The error summary file may help you identify the issue."
I've restarted several times and get the same message. The error summary file states:
Exit Code: 15
Please see specific errors below for troubleshooting. For example, ERROR: