can you turn a pasta salad mix box into macaroni and cheese

I found the boxed mix you were talking about, and the ingredients in it are just the pasta and the seasoning mixture. So, yes, I think you could take a recipe like this one for mac and cheese (no mayo) https://food52.com/recipes/2776-ridiculously-easy-macaroni-and-cheese, and stir the spice mix in as seasoning. I probably would not add much salt to the pasta or use a very salty cheese, because the spice mixture is most likely pretty salty. So make the recipe as written, and add the seasoning a little at a time till it tastes the way you want. Good luck!

I haven't used these particular mixes, but yes have adjusted others to personal taste or dietary concerns.
Once you clear that the pasta salad box has no ingredients you need to avoid, here's what i would do.
Make a sauce using the ingredients they give you and mix it with oil or butter (your preference) and pour over cooked pasta. Taste, Add vinegar or lemon juice if it needs some acid. Probably won't need more salt, as most prepared foods come with lots.
If, on the other hand, there are ingredients in this boxed mix you can't tolerate, there are (for example) eggless pastas out there, and you could make a ranch dressing from scratch with a few basic ingredients.
Either way, please tell us what you did and how it worked out!