I can't find a binary of an old version like that anywhere
You can find all of those files at bitcoin.org/en/release/YOUR_VERSION.
For example, for version 0.9.2:
https://bitcoin.org/en/release/v0.9.2Also, running an old version won't help - it isn't going to synchronize with the network.
Synchronizing the network is not necessary when 'just' extracting the private keys. You don't need to synchronize when just recovering coins.
Running an older version might work due to an older wallet format and should definetly be tried.