Truffle Upgrades on Windows: Error: Artifacts are from different compiler runs

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Hi @redn,

Welcome to the community :wave:

I was able to use your BoxV2 (after modifying Box.sol to make value internal) and run prepare upgrade.

My configuration:

$ npx truffle version
Truffle v5.1.45 (core: 5.1.45)
Solidity - 0.7.1 (solc-js)
Node v12.18.4
Web3.js v1.2.1

Did you try doing truffle compile --all?
See the documentation for details:

As an aside, I use WSL2 in Windows 10. You may want to consider using Windows Subsystem for Linux, see: Solidity Smart Contract development on Windows