A download from CGTrader download includes more than geometry. The package normalization review should cover license scope, dependencies, version assumptions, and the structure of the delivered package.
For CGTrader download, separate source, working, and delivery files. Use stable names for nodes and dependencies, remove unused references, and include a manifest that explains what the downstream user actually needs.
Move files into a predictable folder structure without changing the untouched archive, then rewrite broken relative references. Apply this package normalization guidance to the actual CGTrader download delivery path.