Thank you all for your input. I really do appreciate it.
I have now downloaded:
SkyUI SDK 5.1 from https://github.com/schlangster/skyui/wiki
all scripts included in the archive with the green download button from https://github.com/chesko256/CheskoPapyrusShared
all scripts included in the archive with green download button from https://github.com/chesko256/Campfire
The download links on https://skyrimsurvival.com/home/campfire/mod-developers/ seem to be dead, but are they maybe obsolete thanks to https://github.com/chesko256/Campfire?
The compilation now looks better. It now throws only these two errors types:
D:\Games\The Elder Scrolls - Skyrim\Data\Scripts\Source\_frost_legacyarmordatastore.psc(3098,2):LinkedArrayAddArmor is not a function or does not exist
D:\Games\The Elder Scrolls - Skyrim\Data\Scripts\Source\_frost_legacyarmordatastore.psc(3359,1): LinkedArrayRemoveArmor is not a function or does not exist
I guess I am still missing some scripts? Which mod could they come from? Or shall I try to comment out the dozens of corresponding function lines in _frost_legacyarmordatastore.psc for the compilation process?
_frost_legacyarmordatastore.7z