I recently upgraded from elements 7 to elements 8 (Windows 7 Platform)

The tracks I had on 7 are now giving me a message that the plugin “Groove Agent One” could not be found for instrument track ("##########)

Can someone help me to locate the missing plugin.

In the zip file you downloaded for the Elements 8 update, there should be a folder called Additional Content. Inside there you’ll find a Groove Agent One folder with both 32-bit and 64-bit VST3-format plugins.

You can manually copy them to the appropriate \Program Files\Common Files\VST3 folders depending on which bitness you need.