I have a particular problem. I created a wallet several years ago (yes, when it was still called Bitsquare). I used it to buy and store a not-insignificant amount of bitcoin, and then left it alone, with the idea that I might let it grow in value a bit before starting to trade again.
However, I now find that the software is changed considerably and am wondering:
Can I just download the new version of the software (Bisq) and simply copy the wallet files to the new version of the software?
How can I upgrade or transfer the wallet so that my BTC is accessible and tradeable again?
If I recall correctly there was at least one hardfork since the DAO deployment, so the most failsafe course of action is to move your BTC funds (if there are any) and start a new fresh Bisq installation.
I think I read somewhere that transferring may not work well when transferring from the old bitsquare wallet (something about a deprecated library maybe?). Did I misunderstand that. Should I still be able to transfer my BTC safely to a new wallet?
Either using the seed at Electrum or an old Bitsquare version, you shouldl be able to spend the BTC funds (AKA transfer funds), which is what really matters, other than maybe the data for accounting reasons.