FP4 Root Access is possible, maybe a bit risky

Hi to all
when I follow the first step I get this message:
…Stock backup does not exist…

It is Magisk v27 installed. Might it be that the menues changed?

I found this link from CalyxOs and downloaded the Inkremental Package. Is that the wrong one?

If not, what if I skip some of the incremental packages and try to install the 3.rd or 4.th package, will it work?

Is there a possibility to disable the “auto system updates” of CalyxOs?