TML simply not running

since I don't have my laptop with me as of the moment, I'll provide what I can based off of my memory
I've tried to fix TML not opening through family share a few times now, which I've succeeded in doing so, but I was always met with the problem of that terraria must not be on a legacy version or something along the lines of that
yes, I read the github page that mentions something like this, but terraria is not in a legacy version
I've checked the integrity of the files and all is as should be, but TML itself keeps insisting on that terraria is on a legacy version whereas it is not
steam summer sale is up and I'm thinking about whether I should just buy terraria for myself or try to fix this problem, can someone help me?
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