Thanks for the clarification, but there's honestly no reason for this kindof attitude.Again I will state that you should get to know what the mod is doing before telling me what I am supposedly doing wrong. There is no "mystery" custom upak.u. that's vanilla, so it's not causing any harm. Why does it exist? You don't know, yet you see fit to come and spout bullshit.
This mod isn't for you if you can't follow simple instructions that clearly states all you need to do is backup System to avoid any compatibility issues. It takes zero time and effort to do so.
I am aware there are compatibility issues if you do not follow my instruction. It's the price to pay for having a one-step install.
I've had to remove the download link for the time being until the issues of the presence of upak.u from 227i (which is official content like you said), as oldunreal does not permit the sharing of official content that would otherwise need to be paid for.
Please rectify these issues within the download, otherwise we may not allow this to be linked to oldunreal. None of this is intended to be a personal attack, please calm down.