Hi, it seems Vanilla is alive since at least 2005, can we find the old versions somewhere, for educational purpose?
I gave a look at the github page but I’m not familiar with Git, and it seems to not be there.
I believe this is what you are looking for.
Click on Branches to go to different versions
You could change the version number to what you want and download the zip
also here for earlier versions.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
Older versions are here: http://lussumo-vanilla.googlecode.com/svn/tags/