Yes the amendment would work on 4.012.
Upgrading can take quite a bit of work if there have been lots of modifications to the X-Cart codebase.
Different X-Cart coders take different positions about upgrading heavily modified codebases.
Some will review the changelog and just patch what is important for their cart ; others will make sure they are always upto date.
You'll likely have to patch several files manually after applying the upgrade if you cart is heavily modified, and also apply SQL patches as they won't be applied if the upgrade script wasn't able to patch all the files.
Good luck!
Rubyaryat
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4.2.3 gold [Unix]
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