By default, the Bitcoin Core data directory is hidden in your operating system's system folders: Bitcoin Core :: Download
If you use a custom data directory, the file will be in the root of that specific folder. How to Update Bitcoin Core Software bitcoin core walletdat upd
There is a distinct difference between updating the Bitcoin Core software client and upgrading the data architecture inside the wallet.dat file itself. By default, the Bitcoin Core data directory is
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: When launched, the newly updated Bitcoin Core will read your existing data directory structure and safely initialize your data files. 3. Upgrading the Internal Wallet Format ( upgradewallet )