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Hey Anthony,
1- To update commix and other tools + Parrot OS, check out the documentation here. They offer 3 methods under “How do I upgrade my system.” Let us know if that doesn’t work!
2- In terms of which version you should use, that is up to you. The latest versions will typically have more features and hopefully be more stable. If the versions are close to one another, though, unless there was a big change, they should be similar and return similar results.