Download free kitops first: https://blendermarket.com/products/kit-ops-free?ref=311
/>then add the wparallax pack in the kitops preference: https://blendermarket.com/products/wparallax-free-kpack–one-click-interiors?ref=311
/>if you need more parallax details try these packages
https://blendermarket.com/products/parallax-bundle?ref=311
/>
Parallax materials: https://blendermarket.com/products/pom-parallax-occlusion-mapping?ref=311
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free models:
https://blendereverything.com/category/free-models/