Somebody posted the earliest git commit for Electrum so my advice to you is to clone the Electrum repo from Github (do not browse the commits online because there is no "Earliest" button on Github so you will be clicking "Back" for a really long time".

Then install a Git client if necessary (Git for Windows perhaps).

Then run "git log --reverse" in the Electrum directory to list commits by oldest. Find a commit from 2011 that mentions a version release, then run "git checkout COMMIT_ID" to change the Electrum repo to that version and follow the instructions in the README, build/ etc. files to build the source since you will likely not find it precompiled.