The core promise of the search query is a file size reduction (often advertised as 10GB, 5GB, or even 300MB). This is technically unfeasible for this specific title for the following reasons:
Place all downloaded parts into a single folder. Use a decompression utility like WinRAR or 7-Zip to extract "Part 1". The software will automatically chain and extract the subsequent parts.
A robust livery editor and performance tuning. The Risks of "Free Download" Sites