In case you AOL Gold download upgrade in the operating system and find the display message that the installation has failed, then you can follow the steps given below to troubleshoot this issue:
 First of check the system requirements and any updates that are pending. In case the given system requirements are not fulfilled, then the installation process won't be successful
Fast working internet
1 GB RAM
Operating system to be Windows 7 or higher
1024 X 768 screen resolution
Next, you need to reboot the system and after that reinstall AOL Gold in the system by applying the same process that you would have used earlier.

read more : AOL Gold Error 104