Hmmm. I'm guessing you're on vanilla BG1EE, not Siege of Dragonspear? Looks like that item (which is a scroll of Conjure Earth Elemental) is present on SoD but not vanilla EE, and most of my testing is on SoD.
You are correct, I do not have SoD.
Never had issues installing SCS before but v32 gives me this error. Clean install of BGEE 2.5 from GOG.
ERROR locating resource for 'COPY'
Resource [sCRL7Z.itm] not found in KEY file:
[./chitin.key]
Stopping installation because of error.
ERROR Installing [initialise AI components (required for all tactical and AI com
ponents)], rolling back to previous state
Will uninstall 2409 files for [sTRATAGEMS/SETUP-STRATAGEMS.TP2] component 5900.
Uninstalled 2409 files for [sTRATAGEMS/SETUP-STRATAGEMS.TP2] component 5900.
ERROR: Failure("resource [sCRL7Z.itm] not found for 'COPY'")