Try to contact "BTCurious" (Profile)
In Electrum's official announcement thread, he'd been actively posting Windows binaries of some new releases like:

• v0.22 (prob. typo) - https://bitcointalk.org/index.php?topic=50936.msg616448#msg616448
• v0.23 - https://bitcointalk.org/index.php?topic=50936.msg617449#msg617449
• v0.25 - https://bitcointalk.org/index.php?topic=50936.msg619252#msg619252
• v0.26 - https://bitcointalk.org/index.php?topic=50936.msg621574#msg621574
• v0.28 - https://bitcointalk.org/index.php?topic=50936.msg635374#msg635374

All the links are dead but the user appears to be logging-in his account from time to time, he might have a backup.

HCP's link to the old code could potentially work if you run it from source using the correct version of Python;
unfortunately in my test, I'm getting some errors when restoring a wallet from seed (no GUI) in python 2.x and I'm having trouble installing python 1.x.

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There's also "Brainwallet" but it's not from 2011 but the 1st quarter of 2012, if you're not certain about the date, it's worth the try.
Info: en.bitcoin.it/wiki/Brainwallet
Fork of the "closed" original brainwallet: https://github.com/brainwalletX/brainwalletX.github.io | Only run it on an air-gap machine.
Your mnemonic could be the "passphrase" of a brainwallet.