It says "it's a high-quality replacement pack for the original Arctic Incident models and sounds" so You Don't Need to Overwrite with Remod and Overwrite with HD (This Pack) afterward, just Overwrite the original with HD (This Pack) and You're Good to Go
(Even thought, some Gameplay used both Remod & This pack to Play, but eh, still kinda Count)
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Official ModDB User of Do Tien Linh YouTube Channel, I Enjoy Play Half-Life on Android, but i will NOT Send or Upload to ModDB anything that i keep for my Personality Use