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I just thought it useful to raise the question, as I had not come across the issue/feature before.
Tip: a solid indication that the wallet file's version will be upgraded is if the new version of Electrum wont launch your wallet right after you open it.I just thought it useful to raise the question, as I had not come across the issue/feature before.
Instead, first, it will show you the "Install Wizard" - Choose wallet window:
Pressing "Next" will upgrade the wallet file.