Solutions
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locke1214's post in ERR_FIL_PACK_3 NO SOLUTIONS (IM AT A LOSS) was marked as the answerOkay, so I've narrowed it down to my mods folder. Game loaded in absolutely fine when I verified files and removed all other non-vanilla files. Downloaded the OpenIV thing and immediately had the error. So I guess what I do now is start a clean slate and live to mod another day.