The Windows Coach 7.4 installation has been modified to not reset the Author key to the default value after update. This means that a file, which contains this Author key, will not be overwritten during Coach Installation. Unfortunately for installation of the newest version of Coach on some systems a direct upgrade (installation when an version of Coach older dan 7.4 is installed) does not work correctly. In such situation, the file is deleted and not replaced by the new one, and you get an error message Cannot read Author key file. It may be missing or corrupt. There are two ways to solve this problem:
1. First uninstall the older version of Coach and after that install the new Coach 7.4, or
2. Run “Program and Features” repair.