Failed to install the Download Center plug-in

When you try to manually install ActiveX plug-in, you prompted with this error "Failed to install the Download Center plug-in"

Cause: Appeon plug-in is failed to manually install since the system DLL, atl.dll, is never registered on this machine.

Solution: Login to the computer as Administrator account, open any prompt window and then follow instructions below:

1. Navigate to the directory C:\WINDOWS\system32 or C:\WINNT\system32;

2. Run the command: Regsev32 atl.dll.