I'm also having install trouble. For Tutu, SCS can't install its component "Initialise mod", saying:
ERROR: Failure("IPLOT01K.ITM: read out of bounds ("GET_OFFSET_ARRAY")")
I'd happily install the version of SCS1 the preceded the SCS1-SCS2 unification if it were still available for download! As it is I'm stuck.
edit: it's EasyTutu, btw.
edit2: I got it to work by deleting IPLOT01K.ITM, IPLOT04G.ITM, IPLOT04H.ITM, IPLOT04I.ITM from the Override folder (it must be the same issue here?).