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These are the various methods I've come across to stop Steam from Updating games. The AppManifest option seems to be the most useful but it doesn't hurt to do them all.
CameronF305
paisleyrose103
Serenasimmers1824
Pirry10
ιΈ£ε·ζ¨±ζ΅
carrot
Nahito
MrW503
Momoji3d
rure
ango76
γΎγγγγ
fishemoji
Stinky
vividrabbit
CG Masters
Forest Stook
hiryouman
KageKage
Corst
laomeng
Mitzakan
molly mcdougal
automatic
Nilsimus
ηγ²
TerryXX
Blunder Jub
zelk
Emma Dabiri
OLuM
Ded_173
γγγΎγ¨γ
Lucky
FruitbatFactoryDevelops
JPlunkett
sessho3d
Boring BotLab
LaughtArts
iHoundr