"When the install fails and you get the 1909 error, stop. DO NOT CLOSE the install or click any button. Simply open up another window, browse
to the Program Data directory (C:\Program Data\whatever-the-name-of-the-directory-is, like C:\Program Data\Apple for an iTunes install), right click and select properties, clear
the Read-Only attributes at the bottom of the box and Apply. Then return to the failed install and click retry."
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