That only goes as far back as to version 1.8 from 2015. Electrum's GitHub releases date back to 0.56 from 2012 (
https://github.com/spesmilo/electrum/tags?after=0.57a). I am not sure if it's possible to find versions of the software that are older than that. I think anything older than 3.3.4 can't connect to servers anyway.
It might be a benefit that my suspected version of Electrum doesn't connect to any servers anymore as outmoded software are kinda like rare antiques. Unique in their design, and I made my mnemonic offline anyway.
Optimistically, I might be able to dig up the installation method on the disk that was used back then. Was Electrum installed on Windows using EXE or something else? Or an even more specific question, what derivation path did Electrum use when it very first implemented the 2048 wordlist if BIP 39 wasn't even a thing?