Download
The CoverArt installer for Winamp 2.9x and Winamp 5.xx is available to download for free here. There are also some setup instructions, should they be needed...
Download
Here is the installer for the current CoverArt plug-in.
It runs properly with Winamp 2.90 and higher, as well as Winamp 5.00 and higher versions.
Instructions
Run the installer, follow the steps... and everything should be ok 
Under Winamp, you can activate the CoverArt windows through the main winamp menu. This last can be seen by right-clicking on the main window.
In the same section
Stay tuned!
What others think
«Thanks for the excellent winamp FLAC plugin. (...) Thanks for a great piece of software!»
Alan H.