Here’s concise, actionable guidance.
The file pred677upart19rar is not a broken download—it is simply one piece of a puzzle. To make it "work," you must gather all the other parts in the sequence and initiate the extraction from the first file (Part 1). Once you do this, the content (whether it is a mod, asset, or game) will be accessible and ready to use.
: Part 19 (or another part) may have downloaded incorrectly. Try re-downloading that specific file.
Choose a destination for the "fixed" file and try extracting again.