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According to this guide ?topic=315477.0 I need the bitcoin core wallet, but can I use Electrum instead? I did a

Upgrading and downgrading. How to Upgrade. If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux).

How to mine bitcoins (solo mining) with the core client! - YouTube