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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.
きかんしゃトーリマス
Ashdoge TF
PipPoad
chinaupdate
OmniOkami
がんすきー
monicafit
Shawns Mods
jashinmary
veritablezx22
新 ユウキ
piffledoodle
SirLolsAlottWedgies
fragmandk
ShadeTouched
9889081238292
maloxx🔞
J0RR3L
Rae-chan
leims
Dievtor
チャンジャ乞食
Abhinendra Chauhan
APHRIEL
ねね😺
miss_lv
Ribbirasta
ArtMiner
TheMainTummy
おろみ/UMA
Mr.K
Kuro
FinalFetish
色柴柴的房間
IceLee
ダキニ店長
Otwasmr
あるりれ
ぜのきどん🍑ZENOKIDON
HunTingSuccuBus
BootyPatootie
rattiebutts
Carlos
Team TaC MtG
ASMR THRILLZzz