Well, I found my own answer. For those who want to know:
1) The version is on the menu bar on the add-on drop down menu.
I asked this question because my SODE came by default with Drzewiecki Design UUEE. I never directly installed SODE, and this is possibly why this version wasn't displayed.
2) There probably is no way to uninstall SODE because of the way I obtained it. After installing it, the installation process removed the old version for me, and installed the new one.
3)http://sode.12bpilot.ch is the website, and there is a downloads tab from which the installer can be obtained. The reason I had the verification issue is because only about 3.3 MB of the file was actually downloaded (as in, the download was completed, but the download manager didn't retrieve the entire file size, which is about 6.7MB, as indicated next to the download link.
Hope this helps!