Bug with Enhancer Core 2.1 re-installation?

I made a mistake. I did not install the SDK before I installed the latest Enhancer package.

I want to install all the SDK files from the Enhancer package into the SDK. So, after I installed the SDK I attempted to re-install the latest Enhancer but this seems impossible. Screen shot is below.

I can click on "Proceed" as many times as I want and nothing will progress. Yet, the text implies that there should be a "Yes" button.

Not sure what to do. I am unwilling to manually go through all of the files in the installation files and copy them to the SDK installation directory.

Can someone help?

I have tried to rename the previous backup folder and also search for the text string of the backup folder in Prefs:ENV / the enhancer 2.1 but I cannot find the search string, so I am not sure how the installer knows that I have previously backed this up before.