I am not the only one who finds it hard to make simple readme/"materiel" lists- This is why I recommend using RouteRiter to make a "materiel list" - it tells you exactly which eng/wag files you need.
You need
For the files with "hs" in their name:
http://www.tog-sim.dk/dl/440
LJ M16 AI:
http://www.tog-sim.dk/dl/281
LJ M33 AI:
http://www.tog-sim.dk/dl/118
I don't know where to get the activity you mentioned, or where to download the full M16/M33 packs but they might be on
http://www.trainsim.dk